2026-09-13T06:12:44Z https://publicacoes.softaliza.com.br/cilamce2019/oai

oai:publicacoes.softaliza.com.br:article/6817 2024-08-26T11:32:29Z cilamce2019:ART

CRITICAL BUCKLING LOAD BASED ON MODAL ANALYSIS BY RAYLEIGH METHOD AND FINITE ELEMENT METHOD OF A NONPRISMATIC SLENDER REINFORCED CONCRETE COLUMN Alexandre de M. Wahrhaftig Kaique M. M. Magalhães Reyolando M. L. R. F. Brasil Buckling load Modal analysis Rayleigh method Shape functions Analytical solution Finite element method In this study, an analytical and computational procedure were developed for determining thecritical buckling load. The analytical solution was based on the Rayleigh method and the computationalone on the finite element method (FEM). Rayleigh method preconize that one equation named as shape(or trial) function should be defined to represent the vibrational movement of the system. Therefore, theresult obtained by this method is entirely conditioned to the correct choice of this equation. Differentequations even respecting the boundary conditions of the problem can lead to different results. Fourmathematical expressions as shape function were used in the present study: a trigonometric, twopolynomials and a potential equation. All these functions obey to the boundary conditions of the problemand were valid in the whole domain. Therefore, the integrals obtained by the Rayleigh method weresolved considering the structural geometry. With comparative purpose the results obtained on theanalytical procedure were compared with those yielded by computational modelling using a finiteelement modal analysis. The structure analyzed was a 46-m-high reinforced concrete pole, including itsfoundation, which has geometry and reinforcement arrangement varying along its length. For bothsolutions, three important items were considered: the geometric nonlinearity, due to the slenderness ofthe system; the material nonlinearity and the creep of the concrete. The last one aspect was introducedinto the analysis by means of Eurocode criteria. Significant differences on the absolute value of thecritical load were found in comparison with the adopted procedures, being possible to observe that thepotential equation led to results too distant from the other equations. Analysis considering an elapsedtime of 4000 days revealed an average decreasing of 22% on the intensity of the critical buckling load.The FEM presented the biggest percentual difference, 28%. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6817 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6817/5854

oai:publicacoes.softaliza.com.br:article/6818 2024-08-26T11:32:29Z cilamce2019:ART

NONLINEAR ELASTIC TRANSIENT ANALYSIS OF STEEL FRAMES WITH SEMI-RIGID CONNECTIONS Harley F. Viana Marília C. S. P. Salles Renata G. L. Silva Armando C. C. Lavall Rodrigo S. Costa Geometrical nonlinearity Dynamic analysis Semi-rigid connections Steel structures are reputed to have high slender ratio and excellent ductility. Due to thesefeatures, the second-order effects and the influence of connection flexibility can play an important roleon the behavior of such structures since they can increase the risk of instability. Additionally, it has beenobserved that only the linear static analysis may not describe the real behavior of a structure submittedto various external requests, especially in the case of atypical situations, such as earthquakes and strongwind gusts. Thus, the aim of this research is to evaluate the repercussion of the geometrical nonlinearityand connection flexibility on the transient elastic response of plane steel frames. To this end, it isemployed a geometrically exact nonlinear formulation, based on Euler-Bernoulli model, that considersthe updated Lagrangian formulation and the corotational approach for the consistent deduction of theelement’s tangent stiffness matrix. The theory predicts that nodes will suffer large displacements androtations, and the elements of the structure, large stretches and curvatures. The semi-rigid connection is modelled by a rotational spring element whose behavior is obtained on the basis of a bilinear moment-rotation diagram that follows the kinematic hardening rule. In order to solve the nonlinear transient equations, it is adopted the Newmark’s implicit time integration method combined with the Newton-Raphson technique. The results of the performed analyzes showed a good agreement with the numerical solutions available in the literature, demonstrating the efficiency of the proposed method in obtainingthe geometrically nonlinear dynamic response of steel structures with semi-rigid connections. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6818 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6818/5855

oai:publicacoes.softaliza.com.br:article/6820 2024-08-26T11:32:28Z cilamce2019:ART

FATORES QUE INFLUENCIAM NO MOMENTO CRÍTICO ELÁSTICO DE FLAMBAGEM LATERAL COM DISTORÇÃO DE VIGAS CASTELADAS MISTAS Carla Cristiane Silva Rodrigo Barreto Caldas Viga castelada mista flambagem lateral com distorção momento crítico elástico Vigas casteladas são projetadas para atender diferentes requisitos estruturais e feitas de perfislaminados com aberturas hexagonais padronizadas na alma. O processo de expansão da almaproporciona maior momento de inércia, aumentando a resistência e a rigidez à flexão. Essas vigas podemser simplesmente apoiadas, contínuas e semicontínuas e podem ser projetadas como mistas quando háuma conexão de cisalhamento entre o perfil de aço e a laje de concreto. Em vigas mistas contínuas esemicontínuas, o deslocamento lateral e a rotação da mesa inferior na região de momentos negativos,onde uma parte do perfil de aço é comprimida, podem causar uma flambagem global geralmenteconhecida como flambagem lateral com distorção (FLD). A norma europeia EN 1994-1-1:2004 e anorma brasileira ANBT NBR 8800:2008 fornecem um procedimento para a verificação deste estadolimite último em vigas mistas com seção de alma cheia nas quais o momento fletor resistente à FLD écalculado considerando o comportamento do mecanismo “U” invertido. Um parâmetro essencial para adeterminação desse momento resistente é o momento crítico elástico. Portanto, este artigo tem comoobjetivo investigar o comportamento deste momento analisando os principais fatores que influenciamno fenômeno, tais como, altura e espessura da alma, largura e espessura das mesas, comprimento dovão, tamanho e espaçamento das aberturas. Além disso, uma análise comparativa foi realizada com vigasmistas de alma cheia. Para atingir este objetivo, foram desenvolvidos e calibrados modelos numéricosno software ANSYS com vigas casteladas mistas de aço-concreto submetidas a um momento fletoruniforme. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6820 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6820/5856

oai:publicacoes.softaliza.com.br:article/6821 2024-08-26T11:32:28Z cilamce2019:ART

ASSESSMENT OF THE DYNAMIC STRUCTURAL RESPONSE OF BUILDINGS BASED ON EXPERIMENTAL MONITORING AND FEM SIMULATIONS Leonardo Ferreira de Miranda Leonardo de Sousa Bastos Gilvan Lunz Debona José Guilherme Santos da Silva Buildings Dynamic structural analysis Dynamic experimental monitoring Finite element modelling Numerical analyses based on the Finite Element Method (FEM) simulations are present ineveryday routine of many academic centres and structural design offices around the world. However,one of the problems to be solved is the FEM reliability, in order to represent the actual response of theanalysed structural model. Currently, it is possible to use the results of dynamic experimental monitoringto verify and adjust the numerical model and consequently improve accuracy of the results. The dynamicexperimental monitoring allows the extraction of modal parameters (natural frequencies, vibrationmodes and damping coefficients). These parameters are relevant for a correct characterization of theinvestigated model and are calculated based on the experimental signals of accelerations, velocities anddisplacements. This way, in this work, the modal parameters, related to a real 5-story steel buildingconstructed in laboratory are determined, based on dynamic experimental monitoring. In sequence,aiming to validate the motion equations of the structural system, both numerical and experimentaldynamic responses of the physical model were correlated. The results are presented in terms of modalparameters, frequency response functions (FRFs) and time history. These modal parameters were usedto calibrate the steel building FEM. The proposed computational model, developed for the investigatedsteel building dynamic analysis, adopted the usual mesh refinement techniques present in FEMsimulations implemented in the ANSYS program. In this numerical model, the steel columns wererepresented by three-dimensional beam elements, where flexural and torsional effects are considered.The slabs were represented by shell elements. After that, a forced vibration analysis was carried out andthe dynamic response of the building, when subjected to impact loads, was compared with the actualstructural response of the steel building model. The conclusions emphasize the relevance of the dynamicexperimental monitoring to characterize and adjust the developed FEM of the investigated building. Thegood agreement between the numerical and experimental results can corroborate the adequate use of thedeveloped numerical model. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6821 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6821/5857

oai:publicacoes.softaliza.com.br:article/6822 2024-08-26T11:32:28Z cilamce2019:ART

ASSESSMENT OF THE DYNAMIC STRUCTURAL RESPONSE OF SOCCER STADIUMS GRANDSTANDS BASED ON THE USE OF BIODYNAMIC MODELS Danielle Fernandes Campista José Guilherme Santos da Silva Soccer stadiums grandstands Dynamic structural analysis Biodynamic models Over the years, many soccer stadiums in Brazil have been designed to withstand accidentalloads (people loads) to be of static type (4kN/m2). However, based on the changes in the people’sbehaviour, especially in soccer matches, through the action of groups of fans and also with the use ofthese structures for music shows, these structural systems have been subjected to dynamic impactsrelated to the dynamic nature of the applied loads. Therefore, some of these stadiums have presentedexcessive vibration problems and have required an effective consideration of the dynamic loadings inthe structural design. This way, this research aims to study the dynamic behaviour and evaluate thestructural system performance of the Brasilia National Stadium grandstands, when the human comfortis considered, incorporating the effect of the people-structure dynamic interaction, based on the use ofbiodynamic models representative of the people. It should be noted that the stadium was designed andconstructed to be used at the World Cup 2014, held in Brazil. Finally, a human comfort assessmentwas performed on the investigated grandstands and the results are compared with those provided bydesign standards and international recommendations. The presented results show the relevance of thedynamic analysis in the structural design of soccer stadiums grandstands and the influence of thepeople-structure dynamic effect with respect to obtaining relevant data for human comfort of this typeof structure. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6822 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6822/5858

oai:publicacoes.softaliza.com.br:article/6823 2024-08-26T11:32:27Z cilamce2019:ART

DYNAMIC ANALYSIS OF STEEL-CONCRETE COMPOSITE FLOORS CONSIDERING THE EFFECT OF THE BIODYNAMIC MODELS Fernanda Fernandes Campista José Guilherme Santos da Silva Steel-concrete composite floors Dynamic structural analysis Biodynamic models The main objective of this research work is to investigate the dynamic structural behaviourof steel-concrete composite floors when subjected to human rhythmic activities, considering the effectof the people-structure dynamic interaction, based on the use of biodynamic models representative ofthe people. The investigated structural model was based on a real steel-concrete composite floorspanning 40m by 40m with a total area of 1600m2. The structure represents a typical interior floor of acommercial building used for gym purposes, and designed according to the usual ULS and SLSEurocode provisions. The composite floor is supported by steel columns and is currently submitted tohuman aerobic rhythmic loads. The floor is made from composite beams and a 100mm thick concreteslab and the columns height is equal to 4m. The human comfort evaluation methods used in theinvestigation indicated that the steel-concrete composite floor presented excessive vibrations. Thisway, the presented results show the relevance of the dynamic analysis when the structural design offloors is considered, and also the influence of the people-structure dynamic interaction effect on theassessment of the human comfort of this type of structure. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6823 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6823/5859

oai:publicacoes.softaliza.com.br:article/6824 2024-08-26T11:32:27Z cilamce2019:ART

EVALUATION OF THE HUMAN COMFORT OF A TALL BUILDING CONSIDERING THE WIND NON-DETERMINISTIC ACTIONS Gabriel Bastos da Costa Santos da Silva Leonardo de Souza Bastos José Guilherme Santos da Silva Buildings Dynamic structural analysis Human comfort assessment Based on a favourable economic scenario combined with a significative technologicaladvance in science materials and also construction processes, it must be emphasized that the Braziliancities have shown substantial growth, regarding the construction of tall and slender buildings. Thisarchitectural trend has conducted the design of these buildings to structural solutions composed byvery flexible structural systems, resulting in slender buildings with very low natural frequencies valuesand therefore more susceptible to excessive vibration problems. In this context, it is possible toobserve the project and construction of tall buildings and a notorious example is the city of BalneárioCamboriú/SC, which has several buildings exceeding 100 meters of height. Usually, in the verificationand structural calculations of buildings, the loads due to the wind action are considered purely static.However, as the buildings become slender and taller, problems related to excessive vibrations tend tobe present, since the wind actions have a dynamic nature. This way, the main objective of this researchwork is to investigate the static and dynamic structural behaviour of a slender 39-storey reinforcedconcrete building, with height of 140 meters and a floor plan with 29 meters wide and 9 meters deep,inspired by the real and existing building constructed at Balneário Camboriú/SC. The numericalmodelling of the investigated building is carried out based on the use of the Finite Element Method(FEM) utilising the ANSYS computational program. The investigation considers all the usual loadsused in building projects and also the effect of the wind non-deterministic actions, defined based onthe spectral density of the dynamic excitation. The conclusions reached along this study deal with thecritical evaluation of the non-deterministic dynamic structural response of the investigated buildingand the assessment of the human comfort. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6824 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6824/5860

oai:publicacoes.softaliza.com.br:article/6825 2024-08-26T11:32:27Z cilamce2019:ART

NUMERICAL ANALYSIS OF THE FLEXURAL BEHAVIOR OF DELTABEAM® IN THE SLIM FLOOR SYSTEM Tainá M. Borghi Ana Lúcia H. C. El Debs Composite Structures Slim floor Finite element modeling Deltabeam® The composite structures take the advantages of steel and concrete, creating a more resistantsystem and with an easier assembly. These structures comply the current demands of civil construction,saving time and consequently reducing costs. Therefore, new composite structures have being studiedand established worldwide, such as the slim floor beam. This system consists in steel beams and concreteor composite slabs, reducing the total height of the floor by introducing the slab at the height of thebeam. It is a system that provides a range of possibilities, it may vary the type of steel profile employed,can be the Deltabeam®. Thus, a numerical study of this slim floor typology was carried out, aiming tocompare its flexural behavior with the most usual typology, the Asymmetric Slimflor Beam. The studyis part of an extensive theoretical-numerical research in development at the University of São Paulo(USP), which aims to elaborate a study of slim floor typologies. The finite element modeling is presentedas an alternative to conducting experimental investigations, due to its lower demand for financial, humanand time resources. The ABAQUS® was the software employed in the simulations, and were usedexperimental and numerical studies to calibrate the model, carried out by the National TechnicalUniversity of Athens in partnership with Peikko, which holds the patent of Deltabeam®. From theresults of the simulations, it was possible to conclude that the characteristics of Deltabeam® contributeto a greater rigidity and flexural strength of the system. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6825 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6825/5861

oai:publicacoes.softaliza.com.br:article/6826 2024-08-26T11:32:26Z cilamce2019:ART

OPTIMUM DESIGN OF AN URBAN BUS CHASSIS BASED ON GENETIC ALGORITHM AND FINITE ELEMENT METHOD SIMULATIONS José Elias de Oliveira Gomes Júnior Matheus Abreu Lopes Francisco José da Cunha Pires Soeiro José Guilherme Santos da Silva Bus chassis Optimum design Structural optimization A very important part of the vehicles design is related to the chassis, on which severalmechanical components are mounted. An important feature to the chassis is to provide the highestservice reliability for as long as possible in a cost effective way. During its service life, the chassis issubjected to several static and dynamic loadings. This way, this research work aims to obtain anoptimum design of an urban bus chassis manufactured based on current steel rectangular and “C”section structural elements and subjected to deterministic loads. The optimization problem considersthe dimensions of the structural elements sections of the investigated chassis as its design variables,which are established based on commercial standard dimensions. The lengths of these structural steelelements are fixed in 9.75 m and 2.46 m, respectively. Throughout this investigation, the numericalmodel of the analysed chassis was developed, based on the use of the Finite Element Method (FEM),utilising usual discretization techniques implemented in the ANSYS computational program. Theoptimization problem was resolved using Genetic Algorithms (GA), utilising the MATLAB software.A properly interface between this two software ANSYS and MATLAB was developed in thisinvestigation to work in synergy considering the FEM and the GA. The results of this study show thatit is possible to obtain lower cost designs to the chassis, based on the application of optimizationtechniques as the Genetic Algorithms in structural analysis. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6826 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6826/5862

oai:publicacoes.softaliza.com.br:article/6827 2024-08-26T11:32:26Z cilamce2019:ART

ASSESSMENT OF THE DYNAMIC STRUCTURAL RESPONSE OF HIGHWAY BRIDGES BASED ON A PROGRESSIVE PAVEMENT DETERIORATION MODEL Ana Célia Soares da Silva Rodrigo Guedes Simões José Guilherme Santos da Silva Highway bridges Dynamic structural analysis Finite element modeling Highway bridges are usually subjected to random dynamic actions of variable magnitudedue to vehicles convoys crossing on the bridge pavement deck along their service life. These dynamicactions can generate the nucleation of fractures or even their propagation on the bridge deck structure.The deteriorated road surface condition of the asphalt pavement represents a key issue to thesignificant increase of the displacements and stresses values on the highway bridge decks. Therefore,this investigation aims to develop an analysis methodology, in order to evaluate the displacements andstresses values of a steel-concrete composite highway bridge, including the dynamic actions due tovehicles convoy and the effect of the progressive deterioration of the pavement surface, consideringthe road surface damages. This way, the investigated steel-concrete highway bridge is constituted byfour longitudinal composite girders and a concrete deck, spanning 40m. In this investigation, thedeveloped computational model adopted the usual mesh refinement techniques present in finiteelement method simulations implemented in the ANSYS computational program. The mainconclusions of this study focused on alerting structural engineers to the possible distortions, associatedto the steel-concrete composite bridge dynamic structural response when subjected to vehiclesdynamic actions. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6827 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6827/5863

oai:publicacoes.softaliza.com.br:article/6828 2024-08-26T11:32:26Z cilamce2019:ART

HUMAN-INDUCED VIBRATIONS OF STEEL-CONCRETE COMPOSITE FLOORS SUBJECTED TO HUMAN RHYTHMIC LOADS Felipe Almeida de Sousa Fernanda Fernandes Campista Danielle Fernandes Campista José Guilherme Santos da Silva Steel-concrete composite floors Dynamic structural analysis Biodynamic models The increasing incidence of building vibration problems due to rhythmic activities led toneed of a specific design criterion for rhythmic excitations. This was the main motivation for thedevelopment of a design methodology centred on the structural system dynamical response submittedto dynamic loads due to human rhythmic activities. This way, this paper investigated the dynamicstructural behaviour of steel-concrete composite floors subjected to the human rhythmic activities,when the human comfort is considered, incorporating the effect of the people-structure dynamicinteraction, based on the use of biodynamic models representative of the individuals. The dynamicloads were obtained through experimental tests with individual carrying out rhythmic activities. Theproposed analysis methodology adopted the usual mesh refinement techniques present in the finiteelement method (FEM) simulation implemented in the ANSYS program. The investigated structuralsystem was used based on a health club facility with an adjacent aerobics area. The floor systemconsists of long span joist supported by concrete block walls. The floor effective weight was estimatedincluding people practicing aerobics and also sitting in the health club internal area. The floor effectiveweight was estimated to be equal to 3.6 kPa, including 0.6 kPa for people activities. The effectivecomposite moment of inertia of the joists was selected based on its required strength, i.e.: 1.1x106mm4. The peak acceleration values were compared to limits proposed by design codes, based onhuman comfort and those values were not satisfied. Such fact has indicated that these rhythmicactivities could generate peak accelerations that surpass design criteria limits developed for ensuringhuman comfort. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6828 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6828/5864

oai:publicacoes.softaliza.com.br:article/6829 2024-08-26T11:32:25Z cilamce2019:ART

DETERMINATION OF STRENGTH OF A COMPOSITE SLAB SYSTEM OF STEEL AND CONCRETE BY SEMI-EMPIRICAL M-K METHOD Rafael Oliveira Sena Rodrigo Sernizon Costa Armando Cesar Campos Lavall Renata Gomes Lanna da Silva Composite slabs m-k method longitudinal shear In this work the results of an experimental study of the behavior and strength of a compositeslab system, after the cure of the concrete, are presented. The steel deck consists of trapezoidal profilewith embossments in V-shape. Tests were carried out on a series of twelve composite slab models,simply supported, submitted to bending. Different thicknesses of the steel deck, heights of compositeslabs and shear spans, were employed in the manufacturing of the models, according the EN 1994-1-1:2004 and ANSI/ASCE 3-91:1992. During the tests deflections, end slips and strains of the steeldecks were measured, allowing the analysis of the behavior of the composite slab system and thedetermination of its failure mode. The semi empirical “m-k” method, according ABNT NBR8800:2008, were used for the determination of the longitudinal shear strength of the composite slabsystem of steel and concrete. In order to illustrate the use of the longitudinal shear strength obtained bythe m-k method, an example of practical application will be made. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6829 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6829/5865

oai:publicacoes.softaliza.com.br:article/6830 2024-08-26T11:32:25Z cilamce2019:ART

STRESS ANALYSIS IN FOUNDATION ELEMENTS USING SOIL- STRUCTURE INTERACTION Sabiniano Fernandes Terceiro Gilvan Bezerra dos Santos Júnior Footing FEM Pile cap Structural modeling In the structural building design, it is usually considered the structure supported on a rigidsurface, which does not occur in real situations. It is necessary to analyze the soil deformations toperform a structural determination closer to actual behavior. This work had as objective to analyze thevertical and horizontal stresses of footing and pile cap subjected to normal force of compression. Itmodeled with software that uses as a basis the Finite Element Method. It was analyzed in the footingwith fixed supports, that the loads imposed migrate to the supports just below the perimeter of thecolumn, without significant distribution and the strut-and-tie model was not verified. Therefore, thefoundations model on rigid supports does not satisfactorily represent the actual stresses behavior on theelement. In the footing supported on spring elements, more excellent distribution of the verticalcompressive stresses and the formation of tension and compression areas next to the column can beobserved in horizontal stresses analysis, describing the theoretical strut-and-tie model. The soil-structure interaction analysis in the pile cap did not modify the stress behavior due to being supported as non-deformable or in soil with high resistance. As usually are the supporting layers of piles, with the soil spring stiffness coefficient high, considered as rigid. Therefore, the use of flexible supports made itpossible to analyze the stresses in the footing in an approximate way of real behavior, as observed in theliterature. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6830 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6830/5866

oai:publicacoes.softaliza.com.br:article/6831 2024-08-26T11:32:25Z cilamce2019:ART

DEVELOPMENT OF A FINITE ELEMENT MODEL OF STEEL-CONCRETE COMPOSITE ALVEOLAR BEAMS Matheus E. Benincá Inácio B. Morsch Finite Element Method Composite Beams Cellular Beams Castellated Beams The use of steel-concrete composite beams allows the best properties of these materials to beexplored, enabling the design of larger spans and the achievement of more economical structuralsolutions. The alveolar steel beams, in turn, provide a greater rationalization in the use of this material,since, with almost the same amount of steel, expanded profiles are produced with greater moment ofinertia and, consequently, greater flexural strength and better performance under serviceability limitstates. Through the union of these structural systems the composite alveolar beams are obtained, inwhich the advantages of the two systems are enhanced, and their disadvantages are mitigated. Thus, itis possible to reduce materials consumption and, consequently, the generation of environmental impacts.Considering that the Brazilian and the international standards do not specify criteria for analysis anddesign of composite alveolar beams, numerical and experimental studies have been carried out at theacademic level in order to deepen the understanding about the behavior of these structures, whosecomplexity involves the occurrence of different modes of collapse. The present work aims to contributeto the advances in the field of numerical analysis of composite alveolar beams by developing a finiteelement model with ANSYS software, version 19.2, in which the steel profile was modeled by shellelements, the concrete slab by hexahedral solid elements, the connectors by non-linear spring elements,the steel deck sheet by shell elements and the slab reinforcement bars by embedded elements. In orderto capture the effects of local instabilities, initial geometric imperfections were added to the profilethrough the combination of buckling modes. For the simulation of concrete behavior, two models havebeen used: the first, denominated DP-Concrete, is a native ANSYS model, available in the more recentversions of this software; and the second, denominated usermat, is a customizable model based onOttosen criterion. The validation of the model was done through the numerical analysis of beams testedexperimentally by other authors. The obtained results presented a good correlation with the experimentalresults and with numerical results from previous works. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6831 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6831/5867

oai:publicacoes.softaliza.com.br:article/6832 2024-08-26T11:32:24Z cilamce2019:ART

NUMERICAL ANALYSIS OF PARTIALLY ENCASED STEEL AND CONCRETE COMPOSITE BEAMS IN FIRE USING THE FINITE ELEMENT METHOD José Victor Villela Carlos Pinto Prof. Fabio Martin Rocha Prof. Jorge Munaiar Neto finite element method partially encased composite beams transient analysis thermal gradient It is known that unprotected steel elements perform poorly when exposed to hightemperatures. However, when the concrete is associated with steel elements, there is a gain in both thestructural and thermal aspects. Thus, in this paper, the numerical results of the thermal elevation -obtained by the finite element method - are compared with the experimental resufor partially encased composite beams in a fire. For this, a transient analysis was used todetermine the thermal gradient in the studied sections in order to obtain results closer to thoseobserved in the reference tests. The numerical results showed good approximation, accuratelyrepresenting the experimental model. From that point on, new analysis were carried out in order tocompare the numerical results with those obtained by national normative codes. It was verified that thenormative methods are not able to predict with precision the elevation of temperature in partiallyencased steel and concrete composite sections, being necessary to use alternative methods found in theliterature. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6832 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6832/5868

oai:publicacoes.softaliza.com.br:article/6833 2024-08-26T11:32:24Z cilamce2019:ART

NUMERICAL STUDY OF FAILURE MODES ON SLEEVE CONNECTIONS SUBJECTED TO COMPRESSION Matheus Miranda de Oliveira Lucas Roquete Arlene Maria Cunha Sarmanho numerical analysis steel structures circular hollow sections connections and bolt connection This work presents a study of failure modes on a type of connection between circular hollowsections (CHS), called sleeve connection. It allows a harmony in the continuity of tubular profiles,becoming a discrete connection in a real structure. The proposed connection is composed of two tubes,in which an inner tube with a smaller diameter is connected to the outer tubes by bolts. The objective isto evaluate the behavior of sleeve connections subjected to compression, evaluating the possible failuremodes caused by the variation of the number of bolts and inner tube geometric properties. The studieswere performed through a numerical analysis using the finite element computer program ANSYS. Fromthis model, the variation of the number of bolts and inner tubes properties was performed, wherealterations in the connection’s rigidity were observed. Thus, with the discovery of the failure modes itis possible to propose analytical formulations for sleeve connection design subjected to compression. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6833 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6833/5869

oai:publicacoes.softaliza.com.br:article/6834 2024-08-26T11:32:23Z cilamce2019:ART

A SIMPLIFIED NUMERICAL METHOD OF PREDICTING SETTLEMENTS ON AX- IALLY STRESSED PILES Marlan D. S. Cutrim Valerio S. Almeida Claudius S. Barbosa Jose O. Avesani Neto Soil-structure interaction Piles Settlements Winkler Model Boundary Element Method The aim of this article is to simulate soil-structure interaction on multi-story buildings withdeep foundations (building + pile cap) using a simple numerical model via the Winkler model, based onMindlin’s equations, considering an empirical load transfer model proposed by Aoki-Velloso to calculatebearing capacity in order to obtain settlements and coefficients of subgrade reaction between soil andpile. The advantage of applying this methodology is supported by its simplicity and easy computationalimplementation as well as avoiding a significant computational cost and memory. The use of this simpleproposed procedure is due to the future application in the analysis of more complex group, consideringthe geometric non-linearity of the building and the coupling with a dynamic model associated withfluid mechanics in the numerical wind tunnel solution. The formulation proved to be consistent whencomparing the responses obtained with analytical model - Poulos and Davis - and by numerical procedurevia the Boundary Element Method. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6834 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6834/5870

oai:publicacoes.softaliza.com.br:article/6835 2024-08-26T11:32:22Z cilamce2019:ART

METODOLOGIA PRÁTICA PARA DETERMINAÇÃO DE CABLAGEM EM VIGAS DE PONTES ISOSTÁTICAS Huber R.Tokunaga Paulo Chaves de R. Martins Willian Taylor M. Silva Prestressed concrete Railway bridges Magnel diagrams This paper aims to develop a practical methodology for determining the tendons inprestressed bridge beams. In general, in Brazil, the tendons are defined by methods based on iterativeprocesses, highly dependent on the experience of the designer. Basically, the process involves thedefinition of tendons and section checking. If the expected results are not achieved, the process isrepeated. The proposed methodology will include the determination of the tendons using Magneldiagrams and the definition of the feasible domain, as well the definition of the limit zone for theprestressing steel, considering isostatic structures. This article refers only to a methodology for casesof isostatic bridges. However the final research also aims at the cases of continuous beams anindeterminate bridge structures (Tokunaga,H.[1]). The developed proposal can be applied in manualcalculations or inserted in automated routines, in the framework of an application for practical designprocess as in theoretical studies. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6835 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6835/5871

oai:publicacoes.softaliza.com.br:article/6836 2024-08-26T11:32:21Z cilamce2019:ART

COMPARATIVE STUDY OF CONVERGENCE METHODS FOR NUMERICAL ANALYSIS OF THE BEHAVIOR OF CRESTBOND CONNECTORS APPLIED TO SLENDER CONCRETE FILLED STEEL TUBE COLUMNS Pereira, A. C. Caldas, R. B. Santos, L. R. Vilela, P. M. L. Métodos de Convergência Pilares Mistos Métodos Estáticos Métodos Dinâmicos Este artigo apresenta um estudo comparativo dos diferentes métodos de convergência em análisesnuméricas não lineares do comportamento dos conectores Crestbond quando utilizados comodispositivos de transferência de carga nos pilares mistos preenchidos com concreto (PMPC). A etapaexperimental foi realizada na Universidade Federal de Minas Gerais e, a partir dos resultados obtidos,foi proposto um modelo numérico, elaborado no software Abaqus, capaz de representar o ensaio. Noprocesso de desenvolvimento dos modelos numéricos, testou-se a eficiência de diferentes métodos deconvergência para verificar qual deles apresentaria o melhor custo-benefício em relação ao custocomputacional e ao poder de convergência. Os métodos presentes na biblioteca do Abaqus analisadosno presente estudo foram: Static General, Static Riks e Dynamic Implicit. No entanto, também foramfeitas abordagens sobre o método Dynamic Explicit. O método Dynamic Implicit, bem como oDynamic Explicit, é geralmente, utilizado em problemas dinâmico e com maior grau de deformação.No entanto, esse método pode ser adotado em ensaios mecânicos quando estes apresentam umacréscimo de carga, ou deslocamento, com aceleração consideravelmente baixa, podendo considerar oensaio como quase estático. Realizadas as análises, verificou-se que os métodos estáticos não foramcapazes de obter convergência após ocorrer um decréscimo de força no processo iterativo, apesar depraticamente coincidir com a curva obtida pelo método Dynamic Implicit. Sendo assim, verificou-seque o método Dynamic Implicit não apresentou um custo computacional elevado e demonstrou melhorconvergência, se tornando o método de convergência escolhido para todos os modelos numéricos dopresente estudo. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6836 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6836/5872

oai:publicacoes.softaliza.com.br:article/6837 2024-08-26T11:32:21Z cilamce2019:ART

AVALIAÇÃO NUMÉRICA DE VIDA À FADIGA DE LONGARINAS DE PONTES UTILIZANDO MODELOS DE LARGA ESCALA Victor A. Silva Guilherme S. Alencar Abílio M. P. de Jesus José G. S. da Silva Rui Artur B. Calçada Fatigue test Finite element modelling Stress analysis Fatigue can be characterized as a form of failure of elements subject to cyclic stress/deformation throughout their lifecycle. The phenomenon occurs mainly in mechanical machines,bridges, aircrafts, among other kind of structures. In this context, the study of fatigue is of fundamentalimportance for the design of civil engineering structures, since most of the reported failures can berelated with fatigue. Particular for bridges, the phenomenon is the main responsible for the decrease ofthe bridge’s life, due to the increase of traffic volume and vehicles weights. In this work, the nominalstress method and the hot-spot stress method were used to assess the fatigue strength S-N curves of threedifferent large-scale girder bridge specimens. The girders were modelled using shell and solid elementsand the models were calibrated against fatigue experimental tests available in the literature andperformed mainly in the Fritz Engineering Laboratory of the Lehigh University, Pennsylvania, USA.The fatigue assessment carried out obtained stress results similar to that found in bridges. Theexperimental lives were compared with the lives obtained from the numerical models. Therefore, thiswork emphasizes the importance of the fatigue limit state, either in the design stage or for evaluation ofexisting bridges. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6837 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6837/5873

oai:publicacoes.softaliza.com.br:article/6838 2024-08-26T11:32:21Z cilamce2019:ART

ANALISE NÃO LINEAR DE VIGAS MISTAS AÇO-CONCRETO PROTENDIDAS CONTÍNUAS COM INTERAÇÃO PARCIAL Bruno M. S. de Oliveira Joao B. M. Sousa Jr. Vigas mistas protendidas interação parcial vigas continuas Vigas mistas de aço e concreto podem se beneficiar pela protensao, particularmente pós ten- sionamento, tanto para projeto quanto para reabilitação, avaliação e reparação. A Protens ̃ ao aumenta o ̃regime elastico e melhora o comportamento ultimo e em servico das vigas. A maioria das pesquisas pub- licadas, contudo, foram para o caso simplesmente apoiado de vigas mistas reforçadas por cabos externose muito poucos trabalhos lidaram com o caso contínuo. Essas vigas tem muitas aplicações, por exemplo,  pontes de grandes vaos. As restrições hiperestáticas de vigas mistas mistas protendidas contínuas resul-tam em um comportamento mais complexo quando comparado as simplesmente apoiadas. Além disso, a ́ conexao entre o perfil de aço e a laje de concreto permite deslocamentos relativos entre os componentes, que e chamado conexão parcial de cisalhamento ou interação parcial. O foco deste trabalho  e apresentar o desenvolvimento e implementação de uma formulação numérica, baseado em elemento finito unidi- mensional de viga e cabo para analise n ́ ao linear de vigas mistas ac ̧o-concreto cont ̃ ́ınuas protendidas porcabos externos. A interac ̧ao parcial ̃ e levada em conta por meio de elementos finitos especializados que ́simulam os deslocamentos relativos entre ac ̧o e concreto. A acuracia e precis ́ ao da formulação e avali- ada em comparac ̧ao com testes experimentais. Aspectos específicos da continuidade entre vaos foramanalisados e discutidos. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6838 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6838/5874

oai:publicacoes.softaliza.com.br:article/6839 2024-08-26T11:32:20Z cilamce2019:ART

A COMPARATIVE STUDY OF COST AND RESISTANCE BETWEEN TUBULAR STEEL COLUMNS AND CONCRETE-FILLED TUBULAR STEEL COLUMNS DÉBORA MAIA GUIMARÃES TIAGO CETTO PIETRALONGA ADENILCIA FERNANDA GROBÉRIO CALENZANI steel-concrete composite columns steel columns design cost resistance The use of steel-concrete composite structures is not a recent trend in construction; however,it has significantly increased after the 1960s. The quest for streamlining construction processesencouraged the employment of steel and steel-concrete composite structures. Both structural systemsprovide reductions in cost with labor and materials, as well as increased dimensional precision, structuralefficiency and cleaner construction sites. In this context, the use of steel-concrete composite columns iscommonly observed, and these may present themselves as steel tubular sections, filled with concrete.Such sections provide an increase in compressive strength due to concrete confinement within the steeltube and eliminate the need for form-work and steel reinforcement during construction. Circular steelsections are more efficient to bear torsional forces, and present good behavior when subjected tocombined actions. This study analyzes the main criteria and concepts for the design of compositecolumns with concrete-filled circular hollow sections and steel circular hollow sections according to theBrazilian standards ABNT NBR 8800 and ABNT NBR 16239, under compression and combinedbending. A cost comparison between the two aforementioned types of column was obtained by meansof an algorithm developed with Visual Basic for Applications, considering equivalent resistances andthe prices applied in Brazil’s Southeast region. As an additional analysis, the effect of the confinedconcrete on the overall mechanical resistance of the columns was also evaluated. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6839 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6839/5875

oai:publicacoes.softaliza.com.br:article/6840 2024-08-26T11:32:20Z cilamce2019:ART

INVESTIGAÇÃO DO COMPORTAMENTO DOS FUROS DE CONECTORES PERFOBOND EM DIFERENTES CONDIÇÕES DE PROFUNDIDADE E CONFINAMENTO DO CONCRETO Otavio Prates Aguiar Paulo Estevão Carvalho Silvério Rodrigo Barreto Caldas Perfobond Confinamento Modelo numérico O presente trabalho refere-se a um estudo numérico experimental para desenvolvimento deum novo modelo de cálculo para o conector Perfobond. Este trabalho está sendo empreendido, poisobservou-se na literatura que as diferentes disposições geométricas em que se insere o conector do tipoPerfobond têm grande influência sobre seu comportamento mecânico, podendo-se observar variaçõessignificativas na ductilidade, capacidade resistente e modo de falha do conector em função da profundidade e nível de confinamento do concreto na região da conexão. Portanto, nesse trabalho optou-se por adotar uma nova geometria de ensaio de cisalhamento, similar a um ensaio de arrancamento, que permite simular o conector tanto em situação superficial quanto profunda. Observou-se que o furoconfinado com barra passante apresenta um estágio de resistência secundário onde, após a rupturalocalizada do concreto, a barra passante é mobilizada até sua ruptura, o que dá um acréscimo decapacidade resistente e ductilidade ao conector. Esse acréscimo não é observado no conector superficial,cuja capacidade resistente é definida pela falha localizada do concreto, que, devido à ausência deconfinamento, imediatamente se espalha para a superfície, causando fissuração e destacamento doconcreto. Visando gerar mais dados para a formulação de um novo modelo de cálculo, construiu-se ummodelo numérico no software ABAQUS que reproduz a configuração dos ensaios de cisalhamentorealizados. O modelo foi capaz de simular com boa precisão ensaios experimentais realizados e será, emseguida, utilizado para extrapolar as configurações físicas e geométricas dos protótipos experimentais. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6840 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6840/5876

oai:publicacoes.softaliza.com.br:article/6841 2024-08-26T11:32:19Z cilamce2019:ART

GEOMETRICALLY NONLINEAR TRANSIENT ANALYSIS OF PLANE STEEL FRAMES USING A COROTATIONAL UPDATED LAGRANGIAN FORMULATION Marília C. S. P. Salles Harley F. Viana Renata G. L. Silva Armando C. C. Lavall Rodrigo S. Costa Geometrical nonlinearity Second-order effects Nonlinear transient analysis Updated Lagrangian description Corotational approach. The objective of this research is to present a study of the influence of the geometricalnonlinearities in the dynamic behavior of plane steel frames. The adopted geometrically nonlinearformulation is based on Euler-Bernoulli model and uses the updated Lagrangian description and thecorotational approach to deduce the tangent stiffness matrix of the element with both fixed ends. Thetheory predicts that nodes will suffer large displacements and rotations, and the elements of thestructure, large stretches and curvatures. The solution of the nonlinear equations of motion is achievedby combining the Newmark's implicit time integration method with the Newton-Raphson technique.The results of the performed analyzes showed a good agreement with the numerical solutions availablein the literature, demonstrating the efficiency of the proposed method in obtaining the geometricallynonlinear dynamic behavior of steel structures. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6841 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6841/5877

oai:publicacoes.softaliza.com.br:article/6842 2024-08-26T11:32:19Z cilamce2019:ART

SOLUÇÃO DE VIGA VAGONADA, COMPARADA COM O MODELO DE TRELIÇA PLANA, NO USO DE PASSARELAS COM GRANDES VÃOS. Eduardo Bicudo de Castro Azambuja João da Costa Pantoja Steel structures Structural model Trussed beams Wagon beams Pedestrian Walkway Steel structures, due to the characteristics of the material, presents an efficient relation ofthe resistance with its own weight, which makes it more suitable in works with needs to overcomebigger spans. The Pavilhão com Estufa para Parque Botânico, winner of the 11th ArchitectureStudents Competition of the Centro Brasileiro da Construção em Aço (CBCA), stood out for its goodurban insertion and the choice of the place of implantation, which adapted well to the topography ofthe land and valued the local biome, as well as presenting good use and adequate detailing of the steelstructure. According to the judging committee, the group provided good programmatic integration andan aesthetic quality that stood out from the others. With the aim of promoting lightness and a betterinteraction with the environment, a pedestrian walkway was proposed as a solution to access the set ofbuildings, designed in a metallic structure with a span of 45m and a width of 10m, formed bylongitudinal wagon beams, structural model composed of a horizontal full-width element, columns andcables. The trussed beams is another structural model used in large spans, formed by bars that join innodes, forming triangles. This ensures that when loads act on the nodes, only axial tensile andcompressive stresses will be developed, presenting a slimmer bar sizing and a lighter set to overcomelarge gaps. In this article, we will analyze the structural model of the design of the Pavilhão comEstufa para Parque Botânico, proposed with the use of steel wagon beams and compare with asolution in Pratt trussed beams supported by the same actions and the weight aspect of the structure asa function of the maximum vertical displacement defined in Annex C of ABNT NBR 8800: 2008 [2]. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6842 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6842/5878

oai:publicacoes.softaliza.com.br:article/6843 2024-08-26T11:32:19Z cilamce2019:ART

ANÁLISE INELÁSTICA DE SEGUNDA ORDEM DE ARCOS METÁLICOS COM SEÇÃO I Lidiane R. R. M. de Deus Jéssica L. Silva Ricardo A. M. Silveira Igor J. M. Lemes Arcos metálicos Análise não linear Formulação corrotacional Inelasticidade Acoplamento MRPR / MCD Este trabalho se insere no contexto da Análise Inelástica de Segunda Ordem (AISO) deestruturas metálicas, em particular de arcos metálicos. São apresentas as AISO de arcos metálicos, tantoabatidos, quanto não abatidos, com variadas características, como diferentes seções transversais,condições de contorno e carregamento. Para a realização dessas análises a plataforma computacionalutilizada na simulação dos modelos é o CS-ASA (Silva [1]), um programa baseado no Método dosElementos Finitos (MEF) que realiza a análise não linear estática e dinâmica de estruturas. Nessetrabalho, a formulação do Referencial Corrotacional (RCR) é adotada para introduzir os efeitos da nãolinearidade geométrica, e o comportamento inelástico do material é modelado através do acoplamentodo Método da Rótula Plástica Refinado (MRPR) com o Método de Compatibilidade de Deformações(MCD). A solução estática não linear é baseada numa estratégia incremental iterativa (Método deNewton-Raphson Modificado aliado a técnicas de continuidade). Nos modelos de arcos metálicossimulados, atenção especial é dada aos caminhos de equilíbrio, à influência do fator de abatimento,condições de contorno e carregamento, curvas de capacidade de carga, entre outros. Finalmente, osresultados obtidos com a metodologia proposta são validados através de resultados encontrados naliteratura e aqueles obtidos via MASTAN2 (Ziemian e McGuire [2]; www.mastan2.com), comprovandoo bom funcionamento das formulações utilizadas na análise de diversos arcos, demonstrando que o fatorde abatimento influencia diretamente na malha de discretização da estrutura, que o posicionamento dascargas concentradas em um arco é determinante para conseguir seu melhor desempenho estrutural,dentre outras conclusões. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6843 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6843/5879

oai:publicacoes.softaliza.com.br:article/6844 2024-08-26T11:32:18Z cilamce2019:ART

NUMERICAL STUDY OF STEEL-CONCRETE COMPOSITE STRUCTURES UNDER FIRE SITUATION Rafael C. Barros Dalilah Pires Ígor J.M. Lemes Ricardo A.M. Silveira Thermal analysis Thermo-structural analysis Fire MEF CS-ASA This work aims to study the behavior of steel-concrete composite structures under firesituation. For this, numerical formulations were developed, implemented and evaluated. It is wellknown that high temperature causes changes in physical properties and mechanical strength ofmaterials. In both steel and concrete, such characteristics deteriorate during the exposure to fire, andthe structure load capacity and stiffness are reduced significantly as a consequence of the temperaturerises. This work shows the efficiency of the CS-ASA/FA and CS-ASA/FSA FE code in the analysis ofsteel-concrete composite structural elements. The first provide the temperature distribution at thecross-section level of the elements; the second module was developed to performs the inelasticsecond-order analysis of composite structures under fire using a large displacement FE co-rotationalformulation; the plastic effects are captured through the refined plastic hinge method (RPHM) coupledto the strain compatibility method (SCM). The proposed numerical methodology success is proved bycomparison with experimental and numerical responses available in the literature, which concludesthat the developed computational tool can be used to study the composite steel-concrete cross-sectionstrength and advanced progressive collapse analysis of beams, columns, arches and composite framesunder fire. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6844 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6844/5880

oai:publicacoes.softaliza.com.br:article/6848 2024-08-26T11:32:18Z cilamce2019:ART

COMPARISON BETWEEN STANDARDIZED APPROXIMATED AND RIGOROUS STRUCTURAL ANALYSIS FOR ESTIMATING 2ND ORDER EFFECTS APPLIED TO STEEL STRUCTURES Felipe Cunha Veiga Venturelli D. Sc. Marcelo Miranda Barros M. Sc. Rodolfo de Azevedo Palhares ABNT NBR 8800:2008 geometric nonlinearity steel structures Considering the approximated method of structural analysis estimating 2nd order effectsapplied to steel structures, recommended by the ABNT NBR 8800 (2008) standard, also known asAmplification Coefficients Method, and the constant search for greater structural efficiency andconsequently economy, the aim of this study was to compare the numerical responses of steelstructures subjected to horizontal and vertical loadings, obtained by approximated standardizedanalysis and by rigorous geometrically nonlinear analysis. For that, a program was developed toperform all the constituent steps of the Amplification Coefficients Method and to determine internalforces and displacements. The resulting considered models are useful for medium lateraldisplaceability class in which the 2nd order analysis, as a rule, can be performed by simplified orapproximated method. The results from the approximated approach were compared to the results froma more rigorous nonlinear approach aided by the software SAP2000. It was observed that the internalforces obtained by approximation are similar to those with the rigorous one, concerning axial andshearing forces. Differences can be witnessed regarding bending moment results, being thestandardized method conservative. Analysis of the results from structures classified with small andlarge lateral displaceability were also made, grounding standard classification method and followingproceedures recommendations. Concluding, the normative methodology is a proper approach tononlinear analysis in steel structures as long as classification permits. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6848 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6848/5881

oai:publicacoes.softaliza.com.br:article/6849 2024-08-26T11:32:17Z cilamce2019:ART

INFLUÊNCIA DA VARIAÇÃO DA SEÇÃO DE CONCRETO NO DIMENSIONAMENTO DE PILARES DE SEÇÃO I MISTOS DE AÇO E CONCRETO VIA COMPUTACIONAL Cristiane Caroline Campos Lopes Caroline Martins Calisto Rafaela de Carvalho Saar Hisashi Inoue CES columns ABNT NBR 8800:2008 C language This paper presents the development of a program in C++ language that intends to designcomposite concrete encased steel (CES) columns, which are composed of I-shaped steel that it will betotally surrounded by concrete. The formulation of the program is based on expressions of AttachmentP of ABNT NBR 8800:2008, so it can be possible to obtain an axial compressive force and moments aswell as to verify the interaction between concrete and steel, steel contribution factor and slenderness. Itwas analyzed the influence of the variation of the concrete section in the resistance in terms of momentsof the CES column considering that other parameters remained constant. It is concluded that with theincrease of the concrete section there is an increase of the resistance in terms of bending moments. It isalso possible to perceive that if there is an increase in the height of the concrete section there is a growthin the percentage variation of the bending moment in relation to the x and y axes. While only increasingthe width of the concrete section there is an increase of the bending moment with relation to the y-axisand a small increase with relation to the x-axis, it occurs because the moment of inertia of the profile with relation to the x-axis is much larger than the moment of inertia of the profile with relation to the y-axis. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6849 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6849/5882

oai:publicacoes.softaliza.com.br:article/6850 2024-08-26T11:32:17Z cilamce2019:ART

ESTUDO NUMÉRICO DE VIGAS MISTAS PROTENDIDAS COMPOSTAS POR PERFIS TUBULARES RETANGULARES DE AÇO PREENCHIDOS COM CONCRETO Cristiane Caroline Campos Lopes Paula Vilela Moura Leite Hermes Carvalho Ariany Cardoso Pereira Caroline Martins Calisto Rodrigo Barreto Caldas Preflex perfil tubular retangular preenchido com concreto vigas mistas de aço e concreto protensão externa passiva Este artigo apresenta um modelo numérico capaz de representar o comportamento de vigasmistas com protensão externa passiva durante seu processo de fabricação e quando estão submetidas asolicitações de serviço. Essas vigas mistas são constituídas por perfis tubulares retangulares de açopreenchidos com concreto auto adensável. Esse método de aplicação da protensão consiste em duasetapas. Na primeira, o perfil de aço de seção tubular retangular é submetido a duas forças verticaisconcentradas, localizadas nos quartos do vão; o perfil tubular retangular é, então, preenchido comconcreto e, à medida que este adquire resistência, as forças usadas para deformar o perfil metálico sãoretiradas – segunda etapa. Ao tentar retornar à sua forma inicial, o perfil de aço introduz forças decompressão no núcleo de concreto por meio das superfícies internas tracionadas do tubo que estão emcontato com o núcleo – protensão “passiva” no concreto. O modelo numérico proposto foi desenvolvidono programa ABAQUS® com elementos sólidos tridimensionais C3D8R. Uma vez que a modelagemnumérica do processo de fabricação dessas vigas é bastante complexa nessa fase da simulação foramutilizadas algumas ferramentas avançadas do programa, como “predefined field” e “orphan mesh”.Finalmente, o modelo numérico de viga mista com protensão externa passiva é submetido a umcarregamento distribuído, e os deslocamentos verticais obtidos são comparados com resultados paravigas de aço e mistas de mesma seção transversal sem protensão. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6850 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6850/5883

oai:publicacoes.softaliza.com.br:article/6851 2024-08-26T11:32:17Z cilamce2019:ART

CONCENTRATED NUMERICAL APPROACH FOR SIMULATION OF STEEL-CONCRETE COMPOSITE BEAMS WITH PARTIAL SHEAR CONNECTION ́Igor J. M. Lemes Tawany A. Carvalho Luís E. S. Dias Ricardo A. M. Silveira Amilton R. Silva Partial shear connection Steel-concrete composite beam Concentrated plasticity SCM The present work aims at the implementation and validation of a two-dimensional displace-ment-based numerical formulation for nonlinear analysis of steel-concrete composite beams with de-formable shear connection. A finite element corrotational formulation is adopted in order to allow large displacements and rotations in the numerical model. The degradation of the axial and flexural stiffness isdetermined exclusively at the nodal points of the structural discretization, characterizing the concentratedplasticity. In the cross sections level, the Strain Compatibility Method is used to capture the axial strainsin the component members of the section as well as the slipping at the steel-concrete interface. Thus,the constitutive models of materials under normal stresses and shear connection elements are describedby continuous functions. For validation of the proposed numerical formulation, the results obtainedare compared with numerical and experimental data available in the literature. Since the model proposedhere is based on the concentrated simulation of nonlinear effects, a finite element refinement study is alsoperformed. The numerical responses obtained in this paper are closed to experimental and numerical datapresented in literature. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6851 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6851/5884

oai:publicacoes.softaliza.com.br:article/6852 2024-08-26T11:32:16Z cilamce2019:ART

COMBINANDO AS TÉCNICAS DE BUSCA LINEAR COM CONTINUAÇÃO PARA A SOLUÇÃO DE PROBLEMAS ESTRUTURAIS NÃO LINEARES Jackson S. Rocha Segundo Ricardo A. M. Silveira Andrea R. D. Silva Rafael C. Barros nonlinear structural analysis line search finite element method The demand for computational tools that simulate the real behavior of structures has beenintensified. Such numerical simulations usually involve highly nonlinear problems. For nonlinearstatic problems, in particular, it is fundamental the implementation and use of numerical strategies totrace the structure equilibrium paths in a complete way, overcoming critical points (limit andbifurcations points). In the Finite Element Method (FEM) context, where incremental-iterativestrategies are usually adopted, the nonlinear solvers must have a high level of efficiency in the twophases of the solution process (predictor and corrector), for each load step. In solving the nonlinearalgebraic equations, it is quite common that Newton-Raphson's iterations do not converge or requirean excessive number of iterations near the critical points. Therefore, the linear search optimizationtechnique appears as an additional sophistication. Basically, this technique aims to stagger thecorrective displacements vector in the iterative phase, seeking to guarantee and accelerate theconvergence of the process. The purpose of this work is to verify the efficiency of linear searchtechnique coupled with Newton-Raphson iterations and different path-following methods, and verifyits influence on the nonlinear solver efficiency. The effectiveness of the linear search algorithmimplemented is verified in solving slender structures with accentuated nonlinearity. It is previouslyperceived that such a resource is triggered near load limit points (with more success when applied tostructures with these critical points), accelerates the iterative process and increases the chances ofconvergence. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6852 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6852/5885

oai:publicacoes.softaliza.com.br:article/6853 2024-08-26T11:32:16Z cilamce2019:ART

ATUALIZAÇÃO DE UM MODELO NUMÉRICO EM ELEMENTOS FINITOS DE UMA TORRE EÓLICA PARA AVALIAÇÃO DE PERFORMANCE ESTRUTURAL Aurelio C. Feliciano Guilherme S. Alencar José Guilherme S. da Silva Wind towers Numerical analytical Optimized natural frequencies Wind towers installed around the world have a particular behavior according to theirmechanical properties due to their ability to answer these questions in relation to their structuralperformance. Consisting of steel elements and with a unique cross section, each tower has its own designparameters and state variables that induce other analytical characteristics to be studied. From these wecan find a real model of a wind tower and from this, develop numerical analytical studies, encourageand monitor the execution conditions and structural behavior. This paper presents a calibration of anexperimental model of a wind tower studied by Christophe Thierry Loraux in 2018 in Switzerland.Hoping to determine the optimized natural frequencies of the structure, take the numerical-experimentalmodel as a future research tool for static and dynamic analysis. The numerical optimization performedwas based on the Powell Subproblem Approximation method proposed in 1964, where the limitation ofinaccurate parameters of the tower rotor set mass and the rigidity of the soil-structure interaction isrestricted in the motivation to determine the values. of the unlimited natural frequencies of theexperimental model. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6853 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6853/5886

oai:publicacoes.softaliza.com.br:article/6854 2024-08-26T11:32:16Z cilamce2019:ART

ANÁLISE ESTRUTURAL NUMÉRICA DE PÓRTICOS PLANOS Caroline Martins Calisto Cristiane Caroline Campos Lopes Hisashi Inoue Pórticos planos Método da rigidez Linguagem C As estruturas reticuladas podem ser divididas em estruturas planas e espaciais. Nesse trabalhoserão abordadas as estruturas planas, mais especificamente os pórticos planos. Então, esse artigoapresenta o desenvolvimento de um programa em linguagem C++ que analisa numericamente essasestruturas. A formulação do programa se baseia no Método da Rigidez e é denominado de PORT2D. Asua versão possibilita obter os valores de esforços nas barras, as reações de apoios e os deslocamentosa partir dos seguintes dados de entrada: número de barras, número de nós, número de restrições de apoio,número de nós restringidos, módulo de elasticidade de material, número de barras carregadas e númerode nós carregados. Para validar a estratégia proposta, os resultados obtidos pelo programa PORT2D sãocomparados com a resposta encontrada na literatura e com o software SAP2000. Em ambos os casos, osresultados obtidos pelo PORT2D mostraram ser numericamente coincidentes. Assim, o programaPORT2D apresenta resultados satisfatórios para a análise estrutural de pórticos planos. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6854 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6854/5887

oai:publicacoes.softaliza.com.br:article/6855 2024-08-26T11:32:16Z cilamce2019:ART

MODELO NUMÉRICO PARA ANÁLISE DA CAPACIDADE RESISTENTE ÚLTIMA DE VIGAS HÍBRIDAS SUBMETIDAS À FLEXÃO Caroline Martins Calisto Elvys Dias Reis Cristiane Caroline Campos Lopes Ana Lydia Reis de Castro e Silva Hermes Carvalho Rodrigo Barreto Caldas Vigas híbridas de aço Instabilidade local Seção transversal do tipo I Análise não linear Este artigo apresenta um estudo do comportamento de vigas híbridas de aço com seçãotransversal do tipo I submetidas à flexão. Para isso, foram desenvolvidos modelos numéricos nosoftware Abaqus. Nos modelos, desconsidera-se a flambagem lateral com torção, uma vez que a vigaserá contida lateralmente, de maneira que somente as instabilidades locais sejam avaliadas. As análisesforam divididas em duas etapas, a saber: primeiramente, realizou-se a análise de flambagem elástica para obter as cargas críticas de flambagem e os modos de flambagem das vigas; posteriormente, efetuou-se a análise da capacidade resistente última das vigas considerando tensões residuais e imperfeições iniciais. Os resultados obtidos a partir do modelo numérico desenvolvido foram satisfatórios e, comoesperado, mostraram que as vigas híbridas resistem a um esforço maior de momento fletor quandocomparadas com suas vigas homogêneas correspondentes. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6855 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6855/5888

oai:publicacoes.softaliza.com.br:article/6856 2024-08-26T11:32:15Z cilamce2019:ART

COLAPSO DE VIGAS DE SEÇÃO I AFUNILADAS EM ESTRUTURAS DE AÇO DE GRANDE VÃO: VALIDAÇÃO DO MODELO DE ELEMENTOS FINITOS Tiago C. Zampaolo Ernesto Massaroppi Jr. Miguel Abambres Tiago P. Ribeiro finite element analysis inelastic post-buckling collapse mesh quality steel beam-column tapered member Tapered steel beams and columns have been increasingly used as primary load carryingmembers. The determination of their accurate ultimate capacity can only be achieved by means ofadvanced numerical methods such as the finite element method. This paper presents a systematic study on the influence of the finite element model parameters on the ultimate load of I-section tapered beam-columns typically used in large-span steel frames. It aims the determination of optimal sub-step number to be used during the arc-length scheme and the finite element mesh size for the performanceof an accurate, robust and efficient inelastic post-buckling parametric analysis. This is part of anongoing investigation aimed to use the parametric analysis results to develop analytical predictivemodels of buckling and collapse loads of this type of members, using artificial neural networks. Oncevalidated the finite element model, using hexahedral 8-node finite elements, 5 sub-steps and finiteelement edge sizes of 30 and 40 mm have been selected for use in the future parametric analysis. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6856 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6856/5889

oai:publicacoes.softaliza.com.br:article/6857 2024-08-26T11:32:15Z cilamce2019:ART

NUMERICAL SIMULATION OF THE NONLINEAR SOIL-STRUCTURE INTERACTION PROBLEM Jéssica Lorrany e Silva Ricardo Azoubel da Mota Silveira Ígor J. M. Lemes Soil-structure interaction problem Nonlinear problem Bilateral constraints SCM FE corrotational formulation Structural elements in contact with the soil (or rock) can work as support for the soil itself orcan be supported by the soil. In both cases it is important to evaluate the system movement to reach amore efficient and realistic project. In this context, this work aims to perform a numerical study of thenonlinear soil-structure interaction problem response, always looking for the most realistic engineeringproblem modeling. This interaction will be considered initially as bilateral, i.e., when the structure andthe medium do not lose contact during the strain process, and the soil will be represented by discrete orcontinuous spring models. The numerical methodology is based on the Euler-Bernoulli's theory tosimulate the nonlinear behavior of the structure and on the adoption of the FE corrotational formulationto capture the structure’s large displacements. Plasticity is also considered, concentrated at the finiteelements nodes, through the Strain Compatibility Method (DCM), where the constitutive relations ofthe materials are used explicitly. The DCM is also applied in determining the bearing capacity of thesections. The agreement of the results obtained here with those from the literature and Mastan2 validatedthe numerical formulations implemented in the CS-ASA. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6857 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6857/5890

oai:publicacoes.softaliza.com.br:article/6858 2024-08-26T11:32:15Z cilamce2019:ART

ANÁLISE DE ESTRUTURAS DE CONCRETO EM SITUAÇÃO DE INCÊNDIO Lucas Vieira de Sousa Oliveira Francisco da Chagas Sá Cabedo Junior Rebeka Manuela Lobo Sousa Sávio Torres Melo Situação de Incêndio Comportamento do Concreto Altas Temperaturas O comportamento do concreto frente a altas temperaturas vem se tornando uma linha depesquisa muito requisitada nos últimos anos. Estes estudos se justificam pela alta procura domercado por um elemento estrutural cada vez mais adequado e resistente a situações adversas quepossam ocorrer. Desta forma, o calor ocasionado pelo fogo poderá causar alterações na estruturado concreto, provocando efeitos como perda de resistência, fissuração e modificação datonalidade da coloração do concreto. Algumas situações podem levar uma estrutura ao colapsoquando exposta a altas temperaturas, como: a máxima temperatura atingida pelo fogo naedificação, o tempo que a estrutura ficou exposta ao fogo e a velocidade do resfriamento. Estetrabalho pretende apresentar através da leitura e literatura contemporâneas algumas situações deincêndio existentes e uma forma de minimizar estas situações a fim de proporcionar um devidoconforto e conhecimento sobre os assuntos de estruturas de concreto em situação de incêndio naconstrução civil. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6858 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6858/5891

oai:publicacoes.softaliza.com.br:article/6859 2024-08-26T11:32:15Z cilamce2019:ART

BOUNDARY CONDITIONS FOR HIGH-ORDER LATTICE BOLTZMANN MODELS Luiz Adolfo Hegele Júnior Keijo Kalervo Mattila Jonas Hilbert Hegele Ricardo Leite Martins Bazarin Paulo Cesar Philippi In this work, lattice Boltzmann (LB) regularization is extended to boundary conditions (BC).Dealing with boundary conditions was ever considered a puzzling question in the LB method, especially,when a large set of lattice vectors is required for the description of a given physical problem in highorder models. The most popular BC models are based on Ad-Hoc rules and, although these BC modelswere shown to be suitable for low-order LBE, their extension to high-order LBE was shown to be a verydifficult problem and, at authors knowledge, never solved with satisfaction. In fact, the main questionto be solved is how to deal with a problem when the number of unknowns (the particle populationscoming from the outside part of the numerical domain) is greater than the number of equations we haveat each boundary site. A new boundary condition model is here proposed. The main idea is that whenwe write both the equilibrium and non-equilibrium parts of the discrete populations in terms of itsequilibrium and non-equilibrium hydrodynamic moments, these moments replace the discretepopulations as unknowns, independently of the number of discrete velocities that are needed for solvinga given problem. This idea is here applied to the 2D lid-driven cavity flow problem and improvedstability properties are demonstrated. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6859 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6859/5892

oai:publicacoes.softaliza.com.br:article/6860 2024-08-26T11:32:14Z cilamce2019:ART

DETERMINATION OF RELATIVE PERMEABILITY CURVES IN DIGITAL ROCKS AS FUNCTION OF INITIAL SATURATION USING LATTICE-BOLTZMANN METHOD Carlise Ghisleni Diogo Nardelli Siebert Fabiano Gilberto Wolf Luís Orlando Emerich dos Santos Rodrigo Surmas Relative permeability Initial Saturation LBM Spencer’s Model Sandrock X-ray computed microtomography Digital petrophysics The characterization of fluids in a porous media has attracted interest both academic researchand in engineering. Particularly, the comprehension of fluid displacement in a two-phase system affectsareas as, enhanced oil recovery, geological carbon dioxide sequestration and contaminated groundwater remediation. To properly characterize multiphase fluid transport in porous media it is necessary to con-sider a set of properties that exerts influence in the subsurface flow like wettabillity, capillary pressure, viscosity and initial saturation. In this work, we aim to establish a correlation between initial saturationand relative permeability. The later is a key to estimate two-phase flow in petroleum reservoirs becauseit represents the mobility of one phase in a multiphase saturated porous media. There are many ways todistribute the initial saturation in a porous media. The most common is to randomly allocate the fluids in porous space. Although easily computational implementation, it has no relation with initial distribu-tion expected both from experiments and from natural migration inside reservoirs rocks. To solve this inconsistency, some approaches can be applied: (i) Using gravitational and oscillatory forces to induceseparation in an initially random saturated media; (ii) performing forced-drainage and forced-imbibitionprocesses; (iii) allocating the wetting phase next to the solid walls and (iv) filling the smaller pores withwetting phase. In this work we quantify how relative permeability curves respond to the initial condition(i) e (iii) using the color gradient Lattice-Boltzmann Model to simulate relative permeability curves ina two-dimensional porous medium image obtained previously by Sheppard et al. [1]. It was possible tosee that random saturation implied in relative permeability deviations due the lack of control in fillingporous medium. To EDT, it was also observed some deviations because the nature of algorithm that usedrandom saturation to avoid tendentiousness in filling some porous. The deviations were less apparent inwetting phase than in non-wetting phase. Also, it was observed increase in relative permeability to lowercontact angles due the lubrication effect, both, to random and EDT cases. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6860 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6860/5893

oai:publicacoes.softaliza.com.br:article/6861 2024-08-26T11:32:14Z cilamce2019:ART

LATTICE BOLTZMANN SIMULATION OF A 2D BACKWARD FACING STEP AT LOW TO MODERATE REYNOLDS NUMBER: A COMPARISON OF THE STABIL- ITY OF BGK AND TRT COLLISION OPERATORS Juan P. L. C. Salazar Luis O. E. dos Santos Alejandra C. Lago Diogo N. Siebert Luiz A. Hegele Jr. backward-facing step Lattice-Boltzmann Method stability two-relaxation time operator Bhatnagar-Gross-Krook operator In this study we present Lattice-Boltzmann simulations of a 2D backward facing step flow inthe low to moderate Reynolds number range. A single relaxation time model for the collision operator(BGK) is compared to a two-relaxation-time model (TRT) and 3-D experiments of [Tihon, J., Penkakova,V. and Pantzali, M., 2010. The effect of inlet pulsations on the backward- facing step flow. EuropeanJournal of Mechanics B-Fluid, Vol. 29, pp. 224-235]. Special attention is devoted to detachment andreattachment locations along the line of center of the computational domain, and to numerical stabilitycomparison between BGK and TRT as a function of grid resolution for similar accuracy. A traditionalfinite volume method is also implemented for comparison. Results show that the BGK implementation achieves similar accuracy at lower grid resolution, maintaining numerical stability of the method at re-duced computational cost. BGK and TRT implementations agree with experiments and the finite volume method at Reynolds number of 590. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6861 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6861/5894

oai:publicacoes.softaliza.com.br:article/6862 2024-08-26T11:32:13Z cilamce2019:ART

PERFORMANCE ANALYSIS OF THE LATTICE BOLTZMANN METHOD IMPLEMENTATION ON GPU Waine B. de Oliveira Jr. Alan Lugarini Admilson T. Franco CUDA Graphics processing unit (GPU) Lattice Boltzmann method (LBM) High perfomance computing (HPC) The computational interest on the lattice Boltzmann method (LBM) has grown over the years.The simplicity of its implementation and the local nature of most of its operations allows the use ofa parallel computing architecture. In this way, GPUs (Graphics-Processing Units) suits very well forLBM implementation, offering good performance and scalability for a relatively low price. This workpresents a LBM implementation on GPUs for D2Q9 and D3Q19. It is written in C/C++ programminglanguage and uses CUDA for the use of its GPU resources. For the code optimization, strategies such asmemory layout and merging all operations are presented. Also, designs principles to facilitate alternatingboundary conditions are described. The code is validated and its performance is evaluated. Because ofthe lack of work on the matter, it is analyzed and discussed how some simulation’s parameters affectsthe performance of the code. These are: single and double precision; number of threads per block; ECC(error-correcting code memory) on and off; storing macroscopic variables; domain size; rates of savingand residual. Tests are made using Nvidia’s GPUs from Kepler, Pascal and Volta micro-architectures.The results are considered satisfactory, achieving the state-of-the-art performance. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6862 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6862/5895

oai:publicacoes.softaliza.com.br:article/6863 2024-08-26T11:32:13Z cilamce2019:ART

HIGHER ORDER DISCRETIZATION OF PSEUDO-POTENTIAL MODEL Ricardo Leite Martins Bazarin Christian Naaktgeboren Silvio Luiz de Mello Junqueira Discretization pseudo-potential multicomponent Lattice-Boltzmann mehtod In this paper several discretization schemes that result in a improved multicomponent pseudo-potential model of the Lattice-Boltzmann method are investigated. The discretization scheme here pro-posed, when compared to the model original of Shan and Chen [1], considers the explicitness of the force term, the second order discretization of the stream term, the regularization model and also higherorders of discretization of derivative terms. To verify the accuracy of the proposed model, the effect ofthe viscosity ratio and the spurious currents obtained for the static bubble problem is investigated. The resulting algorithm maintains the simplicity of the pseudo-potential model while allowing an easy im-plementation for multicomponent problems. The results show that the current model, besides showing a higher viscosity ratio range than the literature results, show a significant improvement in the spuriouscurrents range. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6863 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6863/5896

oai:publicacoes.softaliza.com.br:article/6864 2024-08-26T11:32:13Z cilamce2019:ART

DEVELOPMENT OF A COMPUTATIONAL CODE TO CALCULATE HEAT TRANSFER IN MULTILAYER WALLS GONÇALVES FILHO. PEDRO BATALHA AMARAL. HENRIQUE MARIANO COSTA DO SOUSA FILHO. LOURIVAL MATOS DE Finite Volume Method Multilayer Thermal Insulation The main objective of this research is to analyze the thermal behavior of walls submitted todifferent situations, through a program developed by the author. In the program, it is possible to varythe amount of layers in the wall with different materials, to change the color of the surface submitted to the solar radiation, as well as the orientation of the wall in relation to the Sun. The transient and one-dimensional model of the heat equation for solve the problem. Four examples with different properties (number of layers, azimuth, surface absorptivity) were analyzed. The influence of these variations wasverified in each case. In one example, the outer wall temperature without insulation was 28.1667 ° C,internal 27.0295 ° C, while the insulated wall temperatures were 28.1127 ° C and 25.5351 ° C. Aninternal wall reduction of 1.4944 ° C, with a decrease of 5.5287% of the temperature with the inclusionof 2cm (1 cm on each surface) of polystyrene, pearls. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6864 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6864/5897

oai:publicacoes.softaliza.com.br:article/6865 2024-08-26T11:32:12Z cilamce2019:ART

APPLICATION OF INVERSE PROBLEMS ADDING VALUE TO CONTINUOUS MEASUREMENT DATA IN WELLS: THERMAL PROFILE OF REHEATING IN OIL RESERVOIRS Victor Costa da Silva Paulo Couto Franciane Conceição Peters Thermal simulation inverse problem optimization apportionment estimation The authors main objective in this work is to present, from different real conditions of theBraziliam Pres-Salt wells, under various operating conditions, and through complex numerical modelsand optimization tools and problems conversely as the temperature signatures can be considered for theinjectable effect, while the active zone, as well as the saturation of the rest environments as well as thecooling of the same. This objective will be reached though the solution of an inverse problem, regardinglinear optimization aiming the history matching process. The optimization will gives the pursuedinformation, critical for the reservoir management. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6865 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6865/5898

oai:publicacoes.softaliza.com.br:article/6866 2024-08-26T11:32:12Z cilamce2019:ART

MODELING AND SIMULATION OF THE CONCENTRATION OF SPECIES FOR A DIRECT ETHANOL FUEL CELL Marcelo M. De Souza Ranon S. Gomes Alvaro L. De Bortoli Direct Ethanol Fuel Cell Mathematical modeling Overpotential losses The generation of energy is a subject in constant debate, either for its efficiency and renewa-bility or for the emission of pollutants. In addition, energy consumption has grown over the years, and fossil fuels, which account for around 80% of the world’s energy generation, run the risk of becomingscarce. A technology with renewable features that has proven to be promising and more efficient thantraditional power generators is the fuel cell, making the process clean and efficient. The fuel cell is an electrochemical device that directly converts chemical energy into electricity. In this work, a numeri-cal model is developed for fuel cells with proton exchange membrane and fed by ethanol. The model takes into account the flow, the variation of the concentration of chemical species, the rate of passage ofethanol through the membrane and the overpotential losses in the anode and the cathode. In addition,the concentration of each species is modeled according to the current density of the fuel cell. The finiteelement method is used to calculate the flow and concentration of the species in different layers of thecell (inlet and outlet channels, diffusion layer and catalyst layer). The Crank-Nicolson method is used for time discretization. Overpotential losses are calculated using parameters obtained with the numeri-cal model. These losses can be estimated by calculating the activation, the ohmic polarization and the concentration overpotentials. The flow results, the variation of the species concentration, passage of theethanol through the membrane and the limiting current density are shown. Results of cell voltage arecompared for different catalysts and temperatures with experimental data found in the literature. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6866 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6866/5899

oai:publicacoes.softaliza.com.br:article/6867 2024-08-26T11:32:11Z cilamce2019:ART

HIGH ORDER COMPACT METHOD USING EXPONENTIAL DIFFERENCE SCHEMES IN THE SOLUTION OF THE CONVECTIVE DIFFUSION EQUATION Henrique Mariano C. do Amaral Rogerio Gonçalves dos Santos High-Order Exponential Difference Schemas Convective-Diffusion Equations Finite Difference Schemas Computational Fluid Dynamics We will present in this paper scheme for the numerical solution of the convective-diffusive equations in incompressible, inviscid, stationary and transient flows by the technique known as High-Order Exponential Finite Difference Schema. Today, it is generally accepted that a realities arise in the various branches of science, such as physics, biology, chemistry, materials, engineering, ecology, bio-mechanical economics, combustion, computer science, epidemiology, finance, groundwater pollution, heat transfer, neurosciences, physiology, infiltration flow, solids mechanics, and turbulence are modeledby EDP typically similar to the RDC equation - Reaction-Diffusion-Convection Equation. In the lastdecades, many known numerical techniques have been applied to solve this problem. RDC equation:finite differences, finite volumes, finite elements and spectral or meshless, to name a few.In this respect, a general-purpose numerical methodology still does not seem to be available actually.In general, the methods cited are successful when convection, reaction or combination of both acting together are largely dominated by diffusion, tending to purely diffusive process. The situation is drasti-cally altered when convection, reaction, or a combination of both overload diffusion. In such situations, numerical instability arises in cases where diffusion becomes less predominant. Thus, the purpose of thispaper is to present the above scheme. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6867 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6867/5900

oai:publicacoes.softaliza.com.br:article/6868 2024-08-26T11:32:11Z cilamce2019:ART

OPTIMIZATION OF THE GEOMETRIC PARAMETERS OF A TWISTED TAPE FOR THE INTENSIFICATION OF HEAT TRANSFER IN SOLAR COLLECTOR Silva Junior, L. G. Leandro O. Salviano Solar Energy Genetic Algorithm Twisted Tape Heat Transfer Solar Collector Optimization Large is the amount of thermal energy that needs to be supplied for the heating of water indomestic or industrial environments, whether by burning gas, biomass or by direct use of electricity.Today, these traditional methods have been resisted in their expansion in response to the inexorableincrease in demand. In this sense, solar energy has emerged as one of the most attractive renewablesources for this type of application, requiring, in this way, the continuous technological developmentof solar collectors more efficient thermally that meet the application requirements. Thus, the objectiveof this paper is to perform the numerical simulation of the process of intensification of heat transfer ina flat plate solar collector with active system and indirect circulation of single-phase working fluid,through the device known as Twisted Tape, down Reynolds number 600. The geometric parameters ofthe twisted tape subjected to the Direct Optimization approach are: Twisting tape pitch (P), length (L),Translate (T) and twisted tape radius (R1 and R2). The analysis of the optimization process associatedto the heat transfer intensification performance and the associated pressure loss were analyzed throughcomputational modeling in ANSYS and ESTECO ModeFrontier software. The main results of thisproject indicate that the optimization process using the Genetic Algorithm method led to a geometrywith asymmetric radius for both the Reynolds number evaluated, yielding significant resultscorresponding to a global heat transfer increase of approximately 170 %, while the symmetric tapewith twist ratio 4 (R4) increased by 52 %. Evaluating the flow loss, the optimized tapes again showedbetter performance as they increased the pressure loss by about 248 %, while the symmetrical (R4)tapes increased by 268 % for Reynolds 600. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6868 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6868/5901

oai:publicacoes.softaliza.com.br:article/6869 2024-08-26T11:32:10Z cilamce2019:ART

NUMERICAL SIMULATION OF CHOCKED TWO-PHASE FLOW FOR HAZARDOUS AREA CLASSIFICATION Paloma L. Barros Claudemi A. Nascimento Ranny R. Freire Francisco J. de Queiroz Antônio T. P. Neto José J. N. Alves Chocked flow Hazardous area classification CFD Two-phase leakage Two-phase flashing jet is the type of flow that results from the release of liquefied gas intothe atmosphere. The study of this multiphase release is of particular interest in industrial riskassessments, especially when hazardous area classification analysis is applicable. The understanding ofthose release phenomena using numerical techniques is relevant since it contributes with reliable datawhen experimental setup of several scenarios is not feasible. Both the behavior and the characteristicsof these two-phase flow can significantly affect the hazard zone, it means that as more accurate theflashing jet model is, the more rigorous is the definition of the hazardous area. Hence, this work aims topropose a Computational Fluid Dynamic model to predict chocked two-phase flow, thus a more reliablevapor cloud shape can be obtained. The Leung model was implemented for calculating criticalconditions of a propane leak, along with a Eulerian-Lagrangian approach for particle tracking and ShearStress Transport turbulence model in Ansys CFX® software. Simulation results show the plume extentand volume within a safety factor of the lower explosivity limit, velocity and molar fraction profilesalong the jet axis, and shock wave prediction expressed through the Mach number profile. The presentwork demonstrates that the predicted spread angle outcome is crucial to determine the plume volumeand, consequently, to quantify the risk factor. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6869 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6869/5902

oai:publicacoes.softaliza.com.br:article/6870 2024-08-26T11:32:10Z cilamce2019:ART

INVESTIGATION OF SOME PARAMETERS OF A LOW CONCENTRATION EVACUATED TUBE SOLAR COLLECTOR Mavd R. Teles Kamal A. R. Ismail Solar energy Evacuated tube solar collector Eccentric evacuated tube collector This paper investigates the influence of essential parameters on a low concentrationevacuated tube solar collector in their efficiency. The conventional models of evacuated tube solarcollectors have an absorber tube covered by a glass tube with a vacuum between them. The studiedmodel collector has an absorbing tube eccentrically positioned inside a glass cover tube which has areflective film insert on its inner surface and vacuum in eccentric annular space. The proposed modelis based on the conservation equations of mass, momentum and energy and discretized by using thefinite volumes method. A home-built numerical code is developed to evaluate the desired parameters.This code is validated against available experimental and numerical results. The influence on theefficiency of parameters such as absorptivity of the absorber tube, reflectivity of the reflecting surfaceand radius of the absorber tube will be evaluated. Effects of the tracking systems in the thermalefficiency are also evaluated. The results showed that a 20% drop in the absorber’s absorptivity cangenerate a 15% reduction in collector efficiency and a 10% drop in reflectivity of the reflecting surfacecan lead to a drop of around 4% in the efficiency of the solar collector. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6870 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6870/5903

oai:publicacoes.softaliza.com.br:article/6871 2024-08-26T11:32:09Z cilamce2019:ART

NATURAL CONVECTION IN A VENTILATED DOUBLE GLASS WINDOW Taynara Geysa Silva do Lago Kamal Abdel Radi Ismail Mário Ventura Mondlane Natural convection Double glass Passive comfort This study presents the numerical results of the flow problem induced by natural convectionin a channel between asymmetrically heated vertical parallel glass sheets of a ventilated double glasswindow. The model is based on the equations of conservation of mass, energy and momentum in itstwo-dimensional forms. The Finite Volume Method was used in the resolution with discretizationschemes of central differences for diffusive terms and Power Law for the convective terms. For thecoupling of pressure and velocity the SIMPLE algorithm is used, while the TDMA method is used inthe solution of the systems of equations. The numerical code is used to determine the velocity andtemperature fields between the glass sheets under real ambient conditions and asymmetric heatingconditions. The results were validated with available literature results indicating that the model isadequate to solve this type of problem. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6871 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6871/5904

oai:publicacoes.softaliza.com.br:article/6872 2024-08-26T11:32:09Z cilamce2019:ART

NUMERICAL MODELLING OF AXIAL HYDROCYCLONE – PHASE SEGREGATION OF DISPERSED OIL IN CONTINUOUS WATER PHASE Rodrigo V. Cabral Andre D. Rocha hydrocyclone axial inlet particle trajectory computational fluid dynamics This paper presents a numerical model of the particle trajectory in an axial hydrocycloneunder laminar flow conditions using Discrete Phase Model (DPM). The DPM is an implementationof Lagrangian particle tracking which is essentially a means of tracking discrete particles through acontinuum of fluid. The primary phase (continuous phase) is water and the second phase (discrete phase)is oil. The numerical analysis has been carried for laminar axial Reynolds numbers along a 91.2 mminternal diameter size and 2.7 m long pipe. The swirling flow is generated from static swirler with 7vanes, deflection angle of 65.5◦ , and a gap width of 5 mm. The particle trajectory was obtained fortwo Reynolds numbers (150 and 300) and three different diameters (10, 100 e 1000 μm). From thisconditions it is possible to conclued that the larger particle diameter the closer to the center of thecanget closer to the center of the tube along the dowstream flow of the swirler. Besides that, the Reynoldsnumber impact shows that how smaller it was, the closer to the center the particle remais and reaches astable radial position. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6872 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6872/5905

oai:publicacoes.softaliza.com.br:article/6873 2024-08-26T11:32:08Z cilamce2019:ART

THREE-DIMENSIONAL NUMERICAL SIMULATION OF A CENTRIFUGAL COMPRESSOR OPERATING WITH SUPERCRITICAL CO2 Allan Moreira de Carvalho Bruno Jose Nagy Antonio Fabio Saltara Jurandir Itizo Yanagihara Paulo Eduardo Batista de Mello Leandro Oliveria Salviano Daniel Jonas Dezan Centrifugal Compressor Supercritical C02 Computational Fluidynamics Centrifugal compressors performance can be benefited by the low viscosity, high density andsmall compression work of the supercritical CO2. The design and aerodynamic optimization of suchdevices must take into account the flow behaviour under these conditions, that can be ensured by highfidelity three-dimensional computational fluid dynamic simulations. This work presents a numerical modeling and simulation of the highly turbulent, compressible flow inside the impeller of the proof-of-concept supercritical CO2 microcompressor experimentally tested at Sandia National Laboratories. The steady state solution was obtained by solving the three-dimensional Reynolds Averaged Navier-Stokesequations using the comercial software ANSYS CFX. The equation system was closed by the Shear Stress Transport turbulence model. Thermodynamic properties were evaluated through the Aungier ver-sion of Redlich-Kwong equation of state, providing better accuracy near critical point condition than its original version. A grid convergence study was conducted to verify possible numerical error induced bycomputational domain discretization. Finally the numerical method was validated against experimentaldata and the flow characteristics, typical to centrigual compressors, like the suplementary depression andleakage flow losses was discussed. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6873 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6873/5906

oai:publicacoes.softaliza.com.br:article/6874 2024-08-26T11:32:08Z cilamce2019:ART

STABILITY ANALYSIS OF SOLUTIONS OBTAINED BY THE LTSN METHOD FOR A RADIATIVE TRANSFER PROBLEM IN A HIGHLY NON-HOMOGENEOUS MEDIUM Roberto P. Souto Haroldo F. Campos Velho Stephan Stephany Radiative transfer equation Laplace transform discrete ordinate method Sparse direct solver Heat transfer can be a result of a radiative process. In such case, it is modeled by the ra-diative transfer equation (RTE), which is an integro-differential mathematical model that simulates the movement of photons in a medium. However, many other applications are also modeled with the RTE.Here, the RTE outputs the radiance distribution in the considered medium given the boundary conditions,source term, and inherent optical properties, such as the absorption and scattering coefficients as well as the scattering phase function, in the case of a translucid medium. The domain is discretized into the az-imuthal, polar and vertical dimensions. The azimuthal discretization is obtained by the finite expansion of the Legendre polynomial of the scattering phase function, and by the radiance expansion using theFourier decomposition of cosines. The resulting number of azimuthal modes is equivalent to the order ofanisotropy of the medium. The discretization in polar direction domain is made by an approximation ofthe corresponding integral in the RTE, and the number of polar angles denotes the employed quadratureorder. Consequently, the RTE is expressed by a set of linear differential equations, one for each azimuthalmode. The selected case study tackles an anisotropic and non-homogeneous medium, where the verticaldomain is discretized in 80 regions, with 50 polar angles, and the number of azimuthal modes is 174.Therefore, each azimuthal mode requires to solve a linear system of differential equations with 80x50,or 4000 unknowns. The chosen solver is the LTSN method. It emerged in the early 1990s in the neutrontransport research, being further extended to solve radiative transfer problems. The aim of this work isto optimize the number of azimuthal modes and of the quadrature nodes while obtaining stable solutionswith accurate values of radiance. Another approach that is presented here is to solve only one linearsystem for all azimuthal modes, in a single step, with a much larger number of unknowns. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6874 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6874/5907

oai:publicacoes.softaliza.com.br:article/6875 2024-08-26T11:32:08Z cilamce2019:ART

NUMERICAL STUDY OF AN ALUMINOTHERMIC REACTION BY A FOURTH-ORDER FINITE DIFFERENCE SCHEME WITH THE REACTION RATE MODELED AS CONSTANT AND BY THE N-ORDER METHOD Kesiany Maxima de Souza Marcelo Jose Santos de Lemos Thermite Finite Difference Scheme N-Order Method Aluminothermic Reaction Aluminothermic reactions have been widely applied in rail welding, pyrotechnics, and mate-rial synthesis, as they are highly exothermic. However, they are not easily modeled since they involve condensed phases, hardly result in gas products, and produce heterogeneous combustion waves where no thermodynamic equilibrium condition is attained. Moreover, the reaction rate of these reactions de-pends on particle sizes, oxidizer type, mixture ratios, and other physicochemical characteristics. So, major studies about aluminothermic reactions have been experimental, and just a few authors have triedto model the front propagation, shock generation and the kinetics of them. In this point of view, thepresent study aims to model the aluminothermic reaction between hematite and aluminum by solving the energy and mass conservation equations with a fourth-order finite difference scheme in space and first-order forward scheme in time. As there are not enough experimental studies about the activation energy and pre-exponential factor for this specific reaction, the reaction rate was modeled both as a constantand by the n-order method, which considers the dependence of reaction rate on temperature and species concentration and made it possible to observe the sensibility of these parameters. Moreover, the tem-perature dependence of density, specific heat capacity and thermal conductivity were considered in the model. The geometry and boundary conditions were based on experimental data from literature, whichsuccessfully enabled validation of the mean temperature and velocity propagation of the reaction. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6875 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6875/5908

oai:publicacoes.softaliza.com.br:article/6878 2024-08-26T11:32:07Z cilamce2019:ART

NUMERICAL STUDY OF CONJUGATE NATURAL CONVECTION OVER VERTICAL FLAT PLATE WITH PROTRUDING HEAT SOURCES Henrique L. Castro André D. Rocha Marcelo M. Ganzarolli conjugate natural convection protruding elements numerical simulation The paper presents a numerical simulation of conjugate natural-convection heat transfer fromprotruding heat sources in a flat plat mounted vertically. This problem arises as a typical concern ofdesigning electronic systems that involves buoyance-driven flows above heat sources modules. The main objective is to apply a methodology to validate numerical results for vertical position using a bi-dimensional, steady state, finite-volume method and to obtain dynamic and thermal fields. The plate contains seven elements uniformly distributed at the upper surface and an insulation layer at the bottomguaranteeing convection mechanism in only one side of the sources. Fluid physical properties areassumed uniform except for the buoyancy terms, which are obtained from the Boussinesq approximationof Navier-Stokes equations. Heat conduction in the plate is accounted in addition to convection andradiation in order to evaluate heat transfer mechanisms and non-dimensional parameters. Three differentpower inputs were simulated and evaluated using temperature distributions and Nu distribution aroundthe sources XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6878 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6878/5909

oai:publicacoes.softaliza.com.br:article/6879 2024-08-26T11:32:07Z cilamce2019:ART

THERMOELECTRIC POWER PLANT PERFORMANCE AND EMISSION CONTROL SIMULATION Barbara A. P. C. Ferro Ricardo A. V. Ramos Augusto S. Bornschlegell Thermal Power Plant Combustion Gas Cycle Energy is undoubtedly a subject that concerns the government and society. In additionto the economic liability, the environmental aspects are equally important. A thermoelectric powerplant is a solution that fulfill both requirements. The present work evaluated the composition of thecombustion products of a thermoelectric power plant through an analytic and numerical models. Themain polluent components found in the methane combustion products are COX , SOX , NOX andsolid particles. Regarding the ozone formation, the NOX is the most harmful combustion product.Brayton’s thermodynamic cycle, including combustion, was numerically modelled and implementedthrough Scilabcroutines. The input data was based on real power plant operation conditions, which thecompressor isotropic process, the compression rate, the air and fuel mass rates, the combustion chamberand gas turbine’s efficiency are known. The combustion reaction methodology takes into account theequilibrium constants, as proposed in the literature. The combustion products concentration were thenevaluated as they flow through the turbine and are released to the atmospheric conditions. The chemFoamsolver of the OpenFOAM software was used in order to compare the combustion product’s concentrationsobtained with the proposed model. In addition, the results from the combustion model were comparedwith the equivalent air (ideal gas) model, without combustion. The difference in thermal efficiencyestimation was approximately of 28 %. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6879 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6879/5910

oai:publicacoes.softaliza.com.br:article/6880 2024-08-26T11:32:07Z cilamce2019:ART

NUMERICAL SIMULATION OF THERMO-HYDRAULIC PERFORMANCE OF SOLAR AIR HEATER CHANNEL-TYPE WITH PERFORATED DWLS Alexia Ysabelli Antunes Rafael Módolo Dias Duarte Daniel Jonas Dezan vortex generators solar air-heater perforated delta winglets longitudinal vortices computational fluid dynamics The present work numerically investigates the effect of perforated area of DWL pairs incommon-flow-down arrangements mounted in a solar air heater channel-type on thermo-hydraulic performance of the channel. The flow is considered laminar, steady and incompressible. The three-dimensional numerical simulations are performed by using the Finite Volume Method. The imposed inlet velocity to run the numerical simulations is 0.15737 m/s, corresponding to Reynolds number of500 (based on the hydraulic diameter). The angle of attack is kept constant and equal to 30o, and theaspect ratio of the DWLs is 1.9. Results show that, depending on the perforated areas, the frictionfactor decreases about 8% in relation to a standard DWL pair whereas the useful heat gain increasesabout 3%. Finally, the flow field and heat transfer characteristics are investigated and the main resultsare discussed. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6880 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6880/5911

oai:publicacoes.softaliza.com.br:article/6881 2024-08-26T11:32:06Z cilamce2019:ART

TRANSIENT BEHAVIOUR OF VOLUMETRIC SOLAR RECEIVERS Roberta R. Ribeiro Marcelo J.S. deLemos Volumetric solar air receiver Transient modeling Thermal non-equilibrium model The transient behaviors of the volumetric solar air receiver are crucial for understandingand optimizing the receiver characteristics. The present work numerically analyzes the transientbehaviors of the volumetric solar air receiver under various working conditions. Effects of inlet velocity,and thermal conductivity ratio s f k / k on equilibrium temperature was investigated. Higher inletvelocities attain quicker stabilization times and decreases equilibrium temperature, Teq. In addition,increasing s f k / k increases stabilization time as well as equilibrium temperatures. The results are usefulin designing of volumetric solar air receivers and the thermal efficiency increases for lower inletvelocities and higher thermal conductivity ratios, whereas η is reduced for more permeable structuresand higher porosities. Thermal efficiency (η) increases for lower inlet velocities and higher thermalconductivity ratios. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6881 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6881/5912

oai:publicacoes.softaliza.com.br:article/6882 2024-08-26T11:32:06Z cilamce2019:ART

EFFECTS OF DARCY AND REYNOLDS NUMBERS ON THE THERMAL BEHAVIOR OF A THERMOCLINE THERMAL STORAGE SYSTEM Fernando A. Rodrigues Marcelo J.S. de Lemos Turbulent Flow Thermal Non-Equilibrium Porous Media Ventilated cavity Transient heat transfer This work explores the transient behavior of different flow velocities and porosities on thecharging cycle of a thermocline thermal storage system for a concentrated solar power plant filled withsolid porous material. In order to accomplish this goal, a transient model describing turbulent flow in ahybrid medium (porous/clear) with mixed convection was used. Macroscopic flow equations areobtained using the concept of double-decomposition. Discretization of the governing equations wasperformed with the SIMPLE method and the SIP procedure was used to relax the algebraic system ofequations. Turbulent flow was modelled using the k-ε turbulence. A two-energy equation model wasemployed to assess heat transfer between solid and fluid phases. The analyzed geometry consists of anaxisymmetrical tank with convection in the exterior, hot air flow entering the system from the top andclear regions at the top and bottom of the tank. Transient temperatures and storage and chargeefficiencies were evaluated for different Da and Re number values. Results indicated that increasing Revalues improve efficiency up to Re= 3.104 and further increases in Re slightly decreases thermalefficiencies. Finally, it was found that decreasing the permeability of the system by either loweringporosity or lowering particle diameter was beneficial for the thermal charge efficiency. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6882 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6882/5913

oai:publicacoes.softaliza.com.br:article/6883 2024-08-26T11:32:05Z cilamce2019:ART

COMPUTATIONAL SIMULATION AND ANALYTICAL PREDICTION OF AMMONIA LEAKAGE FOR HAZARDOUS AREA CLASSIFICATION Claudemi A. Nascimento Francisco J. Queiroz Paloma L. Barros Ranny R. Freire Antônio T. P. Neto José J. N. Alves Ammonia leakage Emission CFD Hazardous area Ammonia is widely used in several chemical and food industries around the world,nevertheless it is a toxic and flammable component which may cause accidents due to leakage anddispersion. The international standard IEC 60079-10-1 regards flammable components leakage, itaccounts criteria and guidelines for explosive atmosphere formation and reducing the risk of explosion.The standard claims, based on experiences, that a release of ammonia vapor will often dissipate rapidlyin the open air. This scenario will result in a negligible hazardous area extent in most cases. Hence, thiswork aims to investigate ammonia leakage in open air under different leakage conditions. For thispurpose, the authors compared the extent of hazardous area, at the Lower Flammable Limit (LFL), usinganalytical models with those obtained from a 2D Computational Fluid Dynamics model. The CFD modelwas able to predict a characteristic barrel pattern at the exit of the leaking orifice, typical of choked flow.The results obtained from analytical models show that the extent of hazardous area was overestimatedcompared to the CFD model. Among the analytical models used in this study, Souza’s, Tommasini’s,and Ewan and Moodie’s yielded results were closer to the CFD model. Furthermore, the extent ofhazardous area for ammonia release are small, just as the plume volume, when compared to definitionspresented at the international standard IEC 60079-10-1. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6883 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6883/5914

oai:publicacoes.softaliza.com.br:article/6884 2024-08-26T11:32:05Z cilamce2019:ART

THERMAL-HYDRAULIC OPTIMIZATION OF A SOLAR WATER HEATER THROUGH LONGITUDINAL VORTEX GENERATOR Felipe A. S. Silva Luís G. Silva Junior Leandro O. Salviano Solar Water Heater Numerical Simulation Longitudinal Vortex Generator Genetic Algorithm Method Nowadays, the development of technologies to harness energy from renewable sources assolar and wind energy has increased a lot, mainly because of concerns about the burning fossil fueland the fast growth of the populations. The solar energy is a great alternative to meet the increasingdemand based on cost effectiveness and accessibility compared to other sources. For thermal solarapplication, the researchers have been working to enhance the systems to find cheaper process andhigher efficiency. These studies are fundamental in order to promote the use of solar energy for,among other, communities with financial restrictions, domestic activities and industry that need oftemperature at medium level. The Computational Fluid Dynamic (CFD) and Genetic AlgorithmMethodology have been successfully coupled to optimize an objective function problem related toenhancement heat transfer of a solar water heater through Longitudinal Vortex Generators (LVG)which increase the mix between the cold and hot streams near the wall of circular tubes. This passivetechnique can improve the heat transfer by changing the flow dynamic and delay the detachment of theboundary layer. This work aims to find the optimal shape of a stamped vortex generator over a flatplate inside a circular tube for operating conditions similar those find in Brazil. The parameters of thelongitudinal vortex generator evaluated are the angle of attack, height and length which wereoptimized through Genetic Algorithm approach using a commercial software called by ESTECOModeFrontier. The heat transfer and the dynamic flow were solved by ANSYS Fluent for Reynoldsnumber 900. The results show the optimal design of LGV which enhance 62% the heat transfer andincrease 3 times the pressure drop. The velocity and temperature contours show the mix between thehot and cold streams and the low pressure zones size, besides, the streamlines indicated a cornervortex presence. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6884 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6884/5915

oai:publicacoes.softaliza.com.br:article/6885 2024-08-26T11:32:05Z cilamce2019:ART

COMPARING AN ANALYTICAL AND A NUMERICAL MODEL FOR EARTH-AIR HEAT EXCHANGERS IN THE BRAZILIAN SOUTH REGION Nóbrega, E. S. B. Brum, R. S. Ramalho, J. V. A. Quadros, R. S. Earth-Air Heat Exchangers (EAHE) Computer Modeling Computer Simulations The Earth-Air Heat Exchangers (EAHE) represent a promising option to reduce theheating/cooling load of buildings. Unlike traditional air conditioning systems, the EAHE employ arenewable source of energy and they can operate using little electric power. Basically, EAHE useburied ducts, where the air is blown by fans to exchange heat with the soil. Since the first layers of theground are warmer than the outside air in the winter, and colder in the summer, the Earth can be usedas heat source or sink. Therefore, the air leaves the ducts at milder temperatures. Recent research hasshown that these devices can work properly in the south region of Brazil, where prevails a subtropicalclimate. This work aims to compare an analytical model with a numerical one, analyzing their resultswith experimental data from an EAHE installation in the city of Viamão, located in the Brazilian stateof Rio Grande do Sul. As it is shown ahead, the analytical model is not only more simple, but alsomore accurate than the numerical model. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6885 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6885/5916

oai:publicacoes.softaliza.com.br:article/6886 2024-08-26T11:32:04Z cilamce2019:ART

EFFECTS OF STEP POSITION ON THE AERODYNAMIC SURFACE QUANTITIES OF A RAREFIED HYPERSONIC FLOW OVER FORWARD-FACING STEPS Paulo H. M. Leite Wilson F. N. Santos DSMC Rarefied flow Hypersonic flow Forward-facing step Aerodynamic heating This work describes a computational analysis of a non-reacting hypersonic flow in thermalnon-equilibrium over forward-facing steps at zero-degree angle of attack. Effects on the aerodynamicsurface quantities due to changes on the step position have been investigated by employing the DirectSimulation Monte Carlo (DSMC) method. The work focuses the attention of designers of hypersonic configurations on the fundamental parameter of surface discontinuity, which can have an important im-pact on even initial design. Results highlight the sensitivity of the heat transfer, pressure, and skin friction coefficients due to changes on the step position for forward-facing step with different step height. Theanalysis showed that the upstream disturbance in the step configuration decreased with increasing the step position and increased with increasing the frontal-face height. In addition, it was found that pres-sure and heating loads decreased with increasing the step position and increased with increasing the step frontal face height. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6886 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6886/5917

oai:publicacoes.softaliza.com.br:article/6887 2024-08-26T11:32:04Z cilamce2019:ART

SENSITIVITY ANALYSIS BASED ON MORRIS SCREENING METHOD FOR BLADE DESIGN OF A CENTRIFUGAL COMPRESSOR Vitor Cesar N. Mattos Elóy E. Gasparin Paulo Eduardo B. Mello Fábio Saltara Daniel J. Dezan Jurandir I. Yanagihara Leandro O. Salviano Morris screening Centrifugal compressor Sensitivity analysis Impeller CFD model Sensitivity Analysis is an important tool for works that have a several number of inputvariables which can influence the final results when the goal is enhancement of any machine orsystem. For centrifugal compressors, the efficiency depends on the behavior of several phenomenasuch as shock waves and recirculation, which these effects are dependent of the geometry parametersas thickness, angle and shape. In order to find the influence of the thickness and distance betweenmain blade and splitter on total isentropic efficiency, an Elementary Effects analysis associated to arobust CFD model using ANSYS CFX was performed, considering a 4:1 compressor known byNASA CC3. The results indicate that the thicknesses at medium spanwise position are more importantthan those at border. Furthermore, the leading-edge parameters are also more influent than those intrailing-edge. Finally, four variables are found as no significant effect and other five can be used forfuture analysis as optimizations reducing computational cost. The work also shows that the variationon efficiency is closely connected with the changes in most influent parameters due to its geometricchanges in specifically regions which are immersed in the source of losses cited previously. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6887 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6887/5918

oai:publicacoes.softaliza.com.br:article/6888 2024-08-26T11:32:03Z cilamce2019:ART

COMBUSTION SIMULATION OF A PARAFFIN BASED SOLID FUEL WITH GASEOUS OXYGEN INSIDE A HYBRID ROCKET MOTOR Paulo Gabriel Cunha Martins Rene Gonçalves Cristiane Aparecida Martins Leonardo Henrique Gouvea Hybrid rocket motor Combustion simulation Paraffin and gaseous oxygen k-ω SST turbulence model Nozzle analysis During the past two decades, the state of art of hybrid rocket propulsion area has been inresearch of blends containing paraffin-based fuels because paraffin itself shows higher regression rate compared to traditional fuels commonly used, such as hydroxyl-terminated polybutadiene or polyethy-lene, but it does not have good mechanical properties, which increases the risk of grain cracking and rupturing. With the objective to benefit the database development of paraffin-based hybrid rocket propul-sion, this work is devoted to present a numerical study of the combustion process of paraffin and gaseous oxygen during the propulsion of a 100 newtons hybrid rocket motor. The paraffin solid wax was chosenfor the simulation since it exhibits more data about the regression rate with gaseous oxygen in literature.The simulations utilize a mesh with around 100000 quadrilaterals elements, with an average orthogonalquality of 96.5% and an average skewness of 11% . An axis-symmetric volume domain is considered. Paraffin is studied as hexadecane (C16H34) using a reduced reaction mechanism of diesel from “Creck-modeling”. Paraffin is evaluated as a gas at 0, 5 and 10 seconds during a test of the hybrid rocket motor and the results of the simulations are compared. The results analyzed are temperature, pressure and ve-locity profiles inside the hybrid rocket motor. The nozzle and the plume of the exhaust product gases are as well evaluated. This work will contribute to a project of a hybrid rocket motor, where it will operatewith paraffin solid wax and other paraffin-based blends on a laboratory test bench. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6888 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6888/5919

oai:publicacoes.softaliza.com.br:article/6889 2024-08-26T11:32:03Z cilamce2019:ART

STUDY OF BIODIESEL INJECTION OF FLUID DYNAMICS IN DIESEL ENGINES USING OPENFOAM Boniek Evangelista Leite Mábia Ruana Silva de Sena Marcella Mayara Costa Araújo Aragão Severino Rodrigues de Farias Neto openfoam biodiesel cavitation Since the nineteenth century, internal combustion engines their development due tothermodynamic models that describe their operation. The combustion and performance of a dieselcycle engine depend on the quality of the air-fuel mixture and the amount of fuel injected. Ahomogeneous blend results in reduced particulate emissions and higher engine efficiency. For fuelinjection optimization in compression-ignition engines, the use of computational methods as a tool is aviable scientific method. Adding to this the implementation of free and open software enhances theadvantages of numerical methods, since it allows the researcher to have access and can modify theroutines and algorithm used in the simulation calculations. This work aims to study the injection ofbiodiesel (soy) in diesel engines with direct injection. The simulations were performed withOPENFOAM v6, using the cavitatingFoam solver, for the treatment of flow with phase change (liquid- vapour), the simulation is transient, with three-dimensional geometry based on the BOSCH CRIP-1injector, the turbulence model used and the κ-ω SST. The results of numerical simulations comparedwith experimental data available in the literature. Preliminary results show the occurrence of cavitationin the injection channel as a function of injection pressure. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6889 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6889/5920

oai:publicacoes.softaliza.com.br:article/6890 2024-08-26T11:32:02Z cilamce2019:ART

NUMERICAL INVESTIGATION OF UNIFORM FLOW PAST STATIONARY SPHERE USING IMMERSED BOUNDARY-LATTICE BOLTZMANN METHOD Rodrigo S. Romanus Alan Lugarini Admilson T. Franco LBM IBM Regularization Drag The Lattice-Boltzmann method (LBM) has been attracting lot of interest as a tool to solvehydrodynamic problems, mostly due its suitability for parallelization. However, the implementation of boundary conditions in LBM has some hardships, especially for flow domains containing immersed par-ticles. An alternative to overcome this problem is the immersed boundary method (IBM), a numerical technique that uses a secondary Lagrangian mesh and imposes a boundary condition through a force field.This study presents the development of an IB-LBM based algorithm that simulates a free flow around a stationary sphere, which can also be described as a uniform jet stream that encounters a spherical obsta-cle. The fluid domain is described using a D3Q19 lattice arrangement and, a geodesic polyhedron based mesh delineates the spherical boundary. The flow evolution for fluid mesh is simulated using LBGKequation, whose stability is enhanced through regularization, a process which discards non-physical highorder moments from LBM. In order to verify algorithm consistency, this document presents comparisonwith literature benchmark data of flow profiles and drag coefficients for different Reynolds numbers,showing good agreement between present work and available studies. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6890 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6890/5921

oai:publicacoes.softaliza.com.br:article/6891 2024-08-26T11:32:02Z cilamce2019:ART

A STUDY OF CONTINUUM MECHANICS AND PHASE CHANGE PROBLEMS AND IT’S NUMERICAL MODELLING USING OPENFOAM Maicon William Niebus Odone Ophir Valiante Duarte Neto Elson Magalhaes Toledo Luis Paulo S. Barra Aline Cruz Soares Continuum mechanics Computational fluid dynamics Finite volume method OpenFOAM Several applications in continuum mechanics involve processes such as solidification and melting of materials, natural convection, stresses and deformations in solids, among other related pheno-mena. Given the complexity of the phenomena related to these processes, the numerical and computati-onal modeling are powerful and of low costs tools suitable to understand and simulate problems which may envolve one or more of these complex phenomena. In this paper, a set of mathematical modelsrepresenting some of these processes is introduced, discretized and solved by the Finite Volume Method, using open-source package OpenFOAM, a based C++ toolbox for the development of customized nume-rical solvers, and pre-/post-processing utilities for the solution of continuum mechanics problems from computational fluid dynamics, including also static solid elastic problems. Application examples are shown including the gallium melting problem, a process commonly needed in computer chips manufac-turing; the lid-driven cavity problem, widely used for testing, verification and validation of numerical procedures and a simple linear elasticity problem. We show some of the basic features of OpenFOAMas well as explore some of its potential pointing on some possible disadvantages of this code. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6891 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6891/5922

oai:publicacoes.softaliza.com.br:article/6892 2024-08-26T11:32:01Z cilamce2019:ART

ENERGETICAL ANALYSIS OF A REFRIGERATION CYCLE COMBINED WITH CO2, PROPANE AND BRINE Lívia M. S. de Pontes Josegil J. P. de Araújo Natural refrigerants Energy analysis Newton-Raphson Method Carbon dioxide Propane The destruction of the ozone layer was mainly caused by chlorofluorocarbons (CFCs) usedas refrigerants, which were widely utilized during the twentieth century. Another problem produced bythe use of these substances was, and still is, the Global Warming, since these fluids have high "GlobalWarming Potential" (GWP). Due to these consequences, this category of refrigerant was banned andgradually replaced by natural refrigerants such as carbon dioxide (CO2 – R744) and propane (C3H8 –R290). In this work a cascade refrigeration system was analyzed according to the First Law ofThermodynamics (energy analysis). The cascade cycle consists of three subsystems: a vaporcompression cycle using R744 as a working fluid, a system operating with 40% ethylene glycol and avapor compression cycle which uses R290 as a refrigerant. The propane cycle receives heat that hasbeen absorbed in cycles of R744 and 40% ethylene glycol and rejects it into the atmosphere in thecondenser of the R290 cycle. For the cycle analysis, the system was subdivided into 18 control volumesand 23 state points. Equations of mass and energy balances were applied, along with complementaryequations, which they were used to complete the system of equations. The solution of the system ofequations was obtained by applying Newton-Raphson method. The model was implemented in EES®and simulated under different operating conditions. Finally, the thermal efficiency of the R744 cyclewas 8.784; for the R290 cycle, it was 4.09 and 3.393 was the result of the combined cycle. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6892 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6892/5923

oai:publicacoes.softaliza.com.br:article/6893 2024-08-26T11:32:01Z cilamce2019:ART

COMPORTAMENTO FLUIDODINÂMICO DA INTERFCE ÁGUA - AR: MODELAGEM E SIMULAÇÃO Marcella M. C. A. Aragão Severino R. Farias Neto Boniek E. Leite Mábia R. S. Sena Pollutant Dispersion Two – phase CFX Pollution of watery regions such as rivers, lakes, and seas with contaminants that disperse inwater has been a major concern in society in recent times. The dispersion of the various contaminantspresent in the aqueous regions is influenced by various parameters such as: water and air velocity.Therefore, it is of fundamental importance to know the relation of these properties in the propagationof these pollutants.The use of tools that employ numerical methods are applied to predict thedispersion behavior of contaminants present in free surface flows. The purpose of this study was toevaluate the influence of air currents on the water surface. In the proposed mathematical model theEulerian-Eulerian approach was adopted for the two - phase (air-water) flow assuming the free surfacemodel, standard k–ε turbulence model. The constant physicochemical properties were adopted.Numerical simulations were performed using the Ansy CFXR commercial package, varying the valuesof air velocity and height of the water level. The results of the simulations confirm that the behavior ofthe water-air interface is affected by the variation of the air velocity quantity and the height of thewater level of the reservoir. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6893 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6893/5924

oai:publicacoes.softaliza.com.br:article/6895 2024-08-26T11:32:01Z cilamce2019:ART

FEM PARALLEL FRAMEWORK USING OPENCL AND MULTIPROCESSING AP- PLIED TO COMPRESSIBLE TURBULENT REACTIVE FLOWS ON ROCKET EN- GINES WITH THE NEW SUBGRID CLOSURE MODEL Ruhan Ponce Emanuel Rocha Woiski Joao Batista Campos Silva Elaine Maria Cardoso LES Multiprocessing Combustion CBS Parallel Programming Python The objective of this work is to develop a methodology for the numerical analysis of a turbulentcompressible reactive transient flow of a homogeneous premixed mixture within a convergent-divergentnozzle, applicable to rocket engines. The equations of continuity, momentum, energy and conservationof chemical species are discretized by applying the Galerkin finite element method through the CBS(Characteristic Based-Split) stabilization procedure. The Flamelet/Progress Variable scheme is employedto simulate the combustion process and capture the flame front behavior. For the modeling of chemicalkinetics Canterar software is employed which uses GRI-3.0, a combustion mechanism that contains325 reactions and includes 53 chemical species as combustion products. In the context of turbulence, theLES methodology with the novel subgrid closure model will be applied. For the temporal and transientresolution, the Euler explicit scheme was applied, while for the spatial behavior the Element by Element(EbE) method was used, based on the Biconjugated Gradient method for the linear systems resolution,incurring the low memory space associated to local full matrices. A solver was developed in Python,deploying Object Oriented Programming (OOP), with the algebraic system resulting from the temporaland spatial discretization of finite elements combined with homogeneous and heterogeneous parallelism,with CPUs and GPUs through the control of multiprocessing, multithreads and using the OpenCL library.to this type of analysis. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6895 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6895/5925

oai:publicacoes.softaliza.com.br:article/6896 2024-08-26T11:32:00Z cilamce2019:ART

NUMERICAL SIMULATION AND EXPERIMENTAL ANALYSIS FOR THE BUBBLE GROWTH RADIUS BY CONSIDERING THE FLUID-SURFACE INTERACTION Mateus Faria de Andrade Paschoal Leonardo Lachi Manetti João Batista Campos Silva Elaine Maria Cardoso Pool Boiling fem-CBS CVOFLS The advance of new technologies, associated with the minimization of manufacturing andinstallation costs, presents a great challenge for the refrigeration area since the heat generation hasincreased in recent years. Several studies have shown the influence of surface topography on the heattransfer performance, a strategic subject for the development of techniques for cooling of miniaturizedelectronic components, thermal control of satellites, cooling of high concentration photovoltaic cellsand others. The objective of this work is to develop a theoretical and numerical study of the heattransfer phenomenon with phase change involving pool boiling, taking into account the influence ofthe heating surface characteristics and the use of different fluids (e.g., water or refrigerants) by thenumerical simulation of a vapor bubble dynamic onto the heating surface. A computational code isdeveloped in Fortran 90 language to solve the continuity, momentum, energy and interface captureequations in three-dimensional spherical coordinates. Moreover, it is implemented a method tocapture the interface based on the coupled algorithm of Volume of Fluid Method and Level SetMethod (CVOFLS). The effects of microlayer, contact angle and surface tension on the vapor bubbledynamic are also considered. The CVOFLS algorithm also allows the simulation in Eulerian fixedmesh. The finite element method is applied for space discretization and the Characteristic Based Splitscheme (CBS) is applied for time discretization. The comparison with experimental data obtained bythe research group and by other researchers is used to validate the numerical model. Thus, the rate ofbubble growth and the bubble shape could be predicted until its departure time taking into account theeffects of microlayer and surface/fluid interaction. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6896 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6896/5926

oai:publicacoes.softaliza.com.br:article/6897 2024-08-26T11:32:00Z cilamce2019:ART

A COMPUTATIONAL STUDY OF THE HEAT TRANSFER PROCESS IN ANNULAR FINS Lucas E. F. de Souza Jonatha W. S. Araújo Sandi I. S. de Souza Convective Heat Transfer Finned tube Numerical Simulation In this work numerical simulation techniques was used as a way to evaluate the effects ofnatural convection on a horizontal tube with annular fins. Three configurations were studied byvarying the spacing between the fins, 5 mm, 10 mm and 20 mm. The changes in the process of heattransfer as a function of the spacing S and the existence of natural driving were investigated. For this,a geometric model with two domains was developed. A domain contains fluid, Air outside, and a soliddomain composed of a steel tube with fins, where a fixed temperature has been set at the base of thefins. A geometric model was developed and a CFD commercial code, ANSYS-CFX, was used in thenumerical solution of the transport equations. Results for the fields of temperature in the fins and theheat transfer rates are presented. The results showed that the spacing between the fins has a thermalinfluence until stabilized. The temperature distribution on the face were similar. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6897 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6897/5927

oai:publicacoes.softaliza.com.br:article/6900 2024-08-26T11:31:59Z cilamce2019:ART

DISCRETIZAÇÃO MATEMÁTICA DAS EQUAÇÕES NECESSÁRIAS PARA MODELAGEM DE FLUIDO COMPRESSÍVEL BIDIMENSIONAL COM CVFEM Bruno de Sousa Barros Fábio Alfaia da Cunha Compressible flow Numerical simulation CVFEM The present work provides in details the discretization of a set of mathematical equationsrequired to model a two‐dimensional compressible fluid flow. The hypothesis of not viscous flow isconsidered in this work for effect of simplifying the equations, thus the compressible flow of the fluidcan be described by the Euler equations. The control volume based finite element method – CVFEMwas chosen to describe the differential equations of conservation. The numerical method usesunstructured mesh (based on triangular elements) to discretize the geometric domain and the polygonalcontrol volumes for discretization of conservation equations. For that purposed, it was opted for thesegregated solution of the momentum and mass conservation equations, by the use of primitive variables(velocity, pression and temperature) and co-located (integration of the momentum and massconservation equations is done above the same control volume for pressure and velocity). Acomputational code programmed in MATLAB software language was developed to realize thenumerical simulations of compressible flows, two-dimensional (planar or axisymmetric) and transients.The case of a subsonic / supersonic flow through a Channel with a Circular Arc Bump and the case ofthe supersonic flow through the convergent-divergent channel were used to verify the developed code.At the end of the work are presented results obtained by means of a numerical solution and these resultsare compared to results available in literature, to ascertain that the computational code developed worksas it was expected. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6900 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6900/5928

oai:publicacoes.softaliza.com.br:article/6901 2024-08-26T11:31:59Z cilamce2019:ART

NUMERICAL STUDY OF CARBON MONOXIDE DISPERSION IN AN URBAN MICRO REGION Vivian Machado Thiago Antonini Alves Yara de Souza Tadano Atmospheric pollutants Carbon monoxide Numerical simulation Computational fluid dynamics This paper presents the numerical study of the dispersion of carbon monoxide (CO) in anurban micro region, located in the city of Ponta Grossa/PR, Brazil. Three main roads are consideredpolluting sources: Vicente Machado Avenue, Ermelino de Leão Street, and Benjamin Constant Street.The mass flow of CO emission in the simulated routes was calculated based on emission factors andthe counting of the vehicles (cars, buses, trucks, and motorcycles) in the place. The simulations wereperformed using ANSYS/FluentTM 19.1 software. With the results it was possible to obtainvisualizations of the fluid dynamics conditions in the place, behavior of the pollutants and possibleregions of accumulation due to the recirculation. The pollutant concentration results presented valuesof 14.4 ppm, at the monitoring point considering a height of 1.5 m in relation to the soil level. Thevalues obtained in the simulations presented concentrations higher than the 9 ppm limit established bythe guidelines of the World Health Organization (WHO). XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6901 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6901/5929

oai:publicacoes.softaliza.com.br:article/6902 2024-08-26T11:31:59Z cilamce2019:ART

TRANSPORTE SIMULTÂNEO DE CALOR, UMIDADE E SAL EM CONCRETO Rhayssa M. M. Ribas Gerson H. Santos Salt Transport Porus Media Concrete Concrete structures can suffer various types of damage, which can considerably shortentheir life. One of the responsible for this process is the transport of salts into the concrete pores. Inaddition to accelerating the corrosion process in the steel frame, these salts can concentrate at somepoints (nucleation), causing cracks and fractures in the structure, consequently decreasing itsresistance. Thus, the objective of this work is the analysis of how this transport takes place inside theporous structures, simultaneously considering the transport of heat, moisture and salt in the porousmedium. The discretization of the governing equations was performed using the finite volume method,and the algebraic equations system was solved through the MultiTriDiagonal Matrix Algorithm(MTDMA) algorithm, which allows the simultaneous solution of the governing equations. For themodel verification, several simulations considering different boundary conditions were performed andcompared with a model proposed by other authors, showing good similarity between the results. Fromthe results it was possible to observe the influence of moisture transport on the salt displacement insidethe concrete, in the drying and imbibition processes. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6902 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6902/5930

oai:publicacoes.softaliza.com.br:article/6903 2024-08-26T11:31:59Z cilamce2019:ART

NONLINEAR MODELING OF TWO LINKS OF A THREE DEGREES OF FREEDOM ROBOT José Antonio Riul Paulo Henrique de Miranda Montenegro Naor Moraes Melo Robotics Nonlinear system Identification The objective of this paper is the nonlinear modeling of two links of a manipulator robotwith three degrees of freedom (3 DOF).The manipulator robot consists of two rotational joints and aprismatic one. A gearmotor with frequency inverter and two electropneumatic valves are used to drivethe robot. There are dynamic systems that can’t be represented by linear models; in these cases, theuse of nonlinear models is indispensable. Robot Models, known as white box models, that are coupledand presenting nonlinear equations can be obtained using Newton-Euler or Lagrange equations. In thiswork a nonlinear model, known as black box model, will be obtained using data collected from links 1and 3 of the robot and considering the dynamic coupling between the links of the robot. In the modelsobtained the nonlinearities will be in the inputs, and the parameters of the obtained models are linear.A parametric model described by an equation the difference with nonlinearity at the input, is called theVolterra parametric model. Finally, the results obtained will be presented through the generatedmodel. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6903 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6903/5931

oai:publicacoes.softaliza.com.br:article/6904 2024-08-26T11:31:58Z cilamce2019:ART

MINERAÇÃO E ANÁLISE EM BASE DE DADOS EDUCACIONAIS: UMA ABORDAGEM UTILIZANDO CLUSTERIZAÇÃO NOS DADOS DA PLATAFORMA LATTES Guilherme Santos da Silveira Tiago Alves de Oliveira Thiago Magela Rodrigues Dias Analise de dados K-Means Clusterização Mineração de dados Recent technological developments have enabled the generation of large volumes of data thatdue to their complexity, require computational assistance to generate accurate results in a short period oftime. The Lattes Platform is a set of Web systems containing databases of curricula, research groups andinstitutions, focused on the field of Science and Technology and maintained by CNPq. Due to its richdatabase it has important information in the field of Science & Technology. In this article, the feasibilityof applying the data mining methods in the Lattes Platform database is demonstrated externalizing itsknowledge. Thus, as main contributions of this article forms of interpretation, development of standardsand generation of knowledge are presented from this data base, where clustering techniques were applied. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6904 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6904/5932

oai:publicacoes.softaliza.com.br:article/6905 2024-08-26T11:31:58Z cilamce2019:ART

MISSING DATA: BRIEF REVIEW AND CASE STUDIES Giovanni Amormino da Silva Junior Alisson M. Silva Paulo E. M. Almeida Missing Data Missing Completely at Random (MCAR) Missing at Random (MAR) A major difficulty faced in developing real applications that use data streams to solve pre-diction and/or classification problems are the missing data. Although there are techniques to reduce the impacts caused by this problem, most systems are not preventively modeled to allow the adequatetreatment of this type of occurrence. Unreliable or damaged sensors, partial occlusion, interference incommunication, restrictions in the data transmission band, are some of the reasons that can cause thisproblem. Some authors classify this lack of data regarding their randomness and show that in some casesthis absence may also be related to the lack of other attributes. Basically there are two ways of dealingwith missing data: i) exclusion, where all or part of the sample is removed or ignored; and ii) imputation,where the missing value is replaced by zero, by the average of the variable up to the sample with theproblem or by an estimated value, where the problematic variable has its estimated value by some modelthat, in some cases, can lead to variables and/or previous values. In this context, this article presents areview of the literature addressing the main methodologies used to address the problem of missing data.In addition, case studies are presented for comparing results and defining situations where each type ofapproach is best employed. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6905 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6905/5933

oai:publicacoes.softaliza.com.br:article/6906 2024-08-26T11:31:58Z cilamce2019:ART

ANALISE COMPUTACIONAL DE CONDICIONANTES DE RISCOS AMBIENTAIS Caio Vincenzo Reis Dima Gislaine dos Santos Joao Victor Dutra Balboa Jordan Henrique de Souza Luciana Conceição Dias Campos Marcelo Caniato Renhe Machine learning Enviromental risk Data analysis The intense urbanization process since the 1970s, coupled with the lack of adequate housingand social policies, has led large urban centers to disordered occupations and situations of geotechnicalrisk. These occupations were not implemented in a technically correct manner from the point of view ofcivil engineering, considering landscaping, drainage and paving, as well as in the edification. Areas atrisk are regions where it is not recommended to build houses or facilities because they are very exposed tonatural disasters, such as landslides and floods. In Brazil, the main institution responsible for monitoringareas at risk is Civil Defense. There is a large database with history of occurrences of risk areas servedby the Municipal Civil Defense, in Juiz de Fora city, Minas Gerais state - Brazil, from 1996 to 2017.Some important informations contained in this database are the physical aspects of the soil, such asslope, altitude, amplitude, curvature and accumulated flow, as well as processed data from the slidingrisk susceptibility methodologies. The objective of this work is to apply Machine Learning techniques toidentify, from the mentioned database, the susceptibility to the risk of environmental disasters in regionsthat have not yet participated in events attended by the Municipal Civil Defense. This database is largeand unbalanced, so it is necessary to apply data analysis methodologies so as a machine learning modelcan correctly identify the standards with the least human intervention. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6906 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6906/5934

oai:publicacoes.softaliza.com.br:article/6907 2024-08-26T11:31:57Z cilamce2019:ART

BITCOIN OPENING VALUES ANALISYS Filipe Barreto de Oliveira Luciana Conceição Dias Campos Bitcoin crypto-currency Deep Learning Long short-term memory networks A crypto-currency is a decentralized exchange means that uses blockchain technology, whichis a type of distributed log book operated on a point-to-point network of thousands of computers, whereeveryone has an equal copy of the entire transaction history, preventing a central entity from promotingchanges to the registry or to the software unilaterally, and from cryptography to ensure the validity oftransactions and the creation of new currency units. Bitcoin, the first decentralized digital currency inhistory, was created in 2009. The idea with Bitcoin was to replicate the properties of physical money ina digital environment, the digitization of money in the fullest sense of the term. Since then, many othercrypto-coins have been created, and the challenge has been raised to discover which crypto-coins aremost promising to invest. Investing in the financial market involves buying and selling financial assets,and every investor expects to find standards in the market that allow him to buy low value’s assets and sellhigh value’s assets. The objective of this work is to propose a deep learning method to learn the behaviorof increasing or decreasing the opening values of each day of the Bitcoin crypto-currency in an interval ofup to 20 days. We used Bitcoin purchase values from April 2013 to February 2018. Different forecastingstrategies were studied. The experimental results showed relevance in the price trend of Bitcoin. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6907 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6907/5935

oai:publicacoes.softaliza.com.br:article/6908 2024-08-26T11:31:57Z cilamce2019:ART

ANALYSIS OF THE ACADEMIC FORMATION PROCESS OF PHD’s IN ENGINEERING IN BRAZIL Higor A. D. Mascarenhas Thiago M. R. Dias Patricia M. Dias Lattes platform Brazilian scientific exodus Migratory flow Data analysis The exodus of individuals for various reasons or circumstances has been growingsignificantly in recent years in the Brazilian and worldwide scenario. One of the reasons identified forthis migratory flow is the academic formation of these individuals who seek to qualify in higher qualityeducational institutions. Therefore, this work will correspond to the type of qualitative and quantitativeresearch, whose objective will be to analyze how the scientific exodus of Ph’d engineers occurs in Brazil,in which individuals from different localities of the country migrate in search of a better academic andscientific formation. It will be necessary to extract academic data from the curricula of this set ofindividuals registered in the Lattes Platform. Thus, the set to be analyzed will be all individuals withdoctorate degree completed in the Engineering Areas. Then, the data will be filtered, selecting therelevant attributes to the research, and finally the data will be processed in order to find the geographicallocation of the institutions in which they trained. As result it will be possible to make a portrait abouthow the Brazilian scientific exodus occurs with the set of individuals analyzed. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6908 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6908/5936

oai:publicacoes.softaliza.com.br:article/6909 2024-08-26T11:31:57Z cilamce2019:ART

Prediction Brazilian’s Information Science Future Co-Authorships Felipe Affonso Thiago Magela Rodrigues Dias Networks Scientific Collaboration Lattes Plataform When publishing a work together with other scientists, a connection is formed by the colla-boration done. Papers written together represent the edges, and the authors represent the nodes of the network. By using the concepts of social network analysis, it is possible to better understand the relati-onship between these nodes. At this point, the following question arises: ”How does the evolution of the network occur over time?”. In order to answer this question, it is necessary to understand how two nodes interact with one another, that is, what factors are essential for a new connection to be created. The pur-pose of this paper is to predict connections in co-authorship networks formed by doctors with resumes registered in the Lattes Platform in the area of Information Sciences. Currently, the Lattes Platform has6.1 million resumes from researchers and represents one of the most relevant and recognized scientific repositories worldwide. With this, it will be possible to understand the behavior of the network and mo-nitor its evolution over time. Through this study, it will also be possible to identify the researchers who can collaborate in a future moment of time. To this end, recommendation systems will be used, theserepresent a specific approach to the concepts of machine learning. Through the use of this technique it ispossible to understand which attributes of the nodes make them closer to each other, and therefore havea greater chance of creating a connection between them in the future. This work is extremely relevantbecause it uses a data set that has been little used in previous studies. Through the results it will bepossible to establish the evolution of the network of scientific collaborations of researchers at nationallevel, thus helping the development agencies in the selection of future outstanding researchers. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6909 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6909/5937

oai:publicacoes.softaliza.com.br:article/6910 2024-08-26T11:31:57Z cilamce2019:ART

ANALYSIS OF THE CONTEXT OF WORDS IN PORTUGUESE USING WORD2VEC Alexandre D’Elia Myrian C.A. Costa Nelson F.F. Ebecken Valéria M. Bastos Due to the wide availability of textual documents on the Web, there was an intense study onhow the machine should deal with related words and contexts. The usual methods ofrepresenting words as index in a vocabulary have become obsolete for new applications. Facedwith this demand was developed a new way to study words and contexts efficiently. Word2Vec,presented in [1], is a group of templates used to produce word integrations. These models aretwo-layered neural networks trained to reconstruct linguistic contexts of words.Word2Vec takesas input a large text corpus, producing a vector space, typically containing several hundreddimensions, with each unique word in the body being assigned to a corresponding vector inspace. The word vectors are positioned in the vector space so that words that share commoncorpus contexts are located close to each other in space.This paper aims to make an analysis ofdocuments in contexts in the Portuguese language. For a general study on the language, adatabase of 37.5 million randomly selected Web pages was used. In this way, it became possibleto observe the use of words based on the context in which they are inserted in an empirical way.Finally, according to tests, the performance was higher than expected. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6910 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6910/5938

oai:publicacoes.softaliza.com.br:article/6911 2024-08-26T11:31:56Z cilamce2019:ART

A CO-AUTHORSHIP NETWORK ANALYSIS OF RESEARCH FROM GRADUATE PROGRAMS OF THE INTERDISCIPLINARY AREA IN BRAZIL Solon M. Soares Pedro H. T. Schimit academic performance scientific collaboration network social network Scientific collaboration has an increasing acknowledgment as one of the keys to researchquality, which impacts the academic performance of graduate programs (GP). This investigationassesses the researchers' collaboration in terms of the co-authorship network formed by scientific paperspublished by permanent professors in Brazilian GPs from the Interdisciplinary area in 2017. In general,the co-authorship network is formed by permanent professors as the vertices, and the joint publicationof a paper identifies the edges. We obtained data from the Sucupira and Lattes platform of a sample setof 1040 permanent professors, in 56 graduate programs, in 48 universities for the 2017 year. For eachGP, a collaborative network was created based on published articles, and topological parameters, likecluster coefficient, density, diameter, degree, and shortest path were calculated. Other variables havebeen taken into consideration to help the analysis, such as the GPs number of permanent professors, theGPs evaluation grade applied by CAPES in the 2013-2016 period analysis, the university managementtype (public or private), and the region from Brazil where it is located. Therefore, the objective is toverify the variables which may indicate the GP quality, and although the properties of the network arenot statistically related to the GP quality, they help to analyze some characteristics of GPs according tothe management type of the institution. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6911 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6911/5939

oai:publicacoes.softaliza.com.br:article/6912 2024-08-26T11:31:56Z cilamce2019:ART

SOLAR IRRADIATION FORECASTING BY THE APPLICATION OF FIVE MACHINE LEARNING ALGORITHMS Felipe P. Marinho Juliana S. Brasil Juarez P. A. Neto Paulo A. C. Rocha Maria E. V. Silva Ricardo J. P. Lima Solar irradiation forecast Machine learning Global irradiation Minimal learning machine Renewable energy In this work, the forecast of global solar irradiation for a one-day ahead forecast horizon wascarried out using some machine learning models, namely: Minimal Learning Machine, Support VectorMachine, Random Forests, K- Nearest Neighbors and a regression tree with the application of a Baggingprocedure. The Minimal Learning Machine algorithm is a relatively recent method based on the distancecalculation between vectors and used for supervised learning purposes in both classification andregression problems. In addition, we used a data set with the presence of attributes (predictors) formedby exogenous variables (insolation, air temperature, precipitation, etc.), endogenous variables (solarirradiation historical data) and temporal variables (year, month and day of measurement) totalizing 44attributes and 3254 observations. The root mean squared error and forecast skill obtained by applyingthe Minimal Learning Machine in the validation set were respectively 40.882 W/m2 and 7.637 %, andthe arithmetic mean of the root mean squared error in conjunction with the arithmetic mean of theforecast skill obtained by the use of the other models for the same validation set were 40.752 W/m2 and7.93 %. In this way, it can be drawn by the evaluation of the results that the Minimal Learning Machinepresents a performance comparable to the classic machine learning methods. Furthermore, it presentsthe advantage in the training stage of using only a single adjustment parameter. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6912 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6912/5940

oai:publicacoes.softaliza.com.br:article/6913 2024-08-26T11:31:56Z cilamce2019:ART

BINARY SHADING CLASSIFICATION BY MEANS OF AN IDENTIFICATION ALGORITHM FOR RADIATION TRANSITIONS USING LOW COST SENSORS Felipe P. Marinho Juarez P. Amorim Juliana S. Brasil Jonathan B. Araújo Paulo A. C. Rocha Maria E. V. Silva Ricardo J. P. Lima Beam irradiation Global irradiation Irradiation identification algorithm Standard algorithm In the current energy scenario, renewable energies such as solar and wind power havesignificant relevance. In this context, an algorithm capable of recognizing irradiation transitions wasimplemented. This algorithm was used to classify data obtained from light dependent resistance in twoclasses: shadow and non-shadow. These results were compared with those obtained by a standardalgorithm that has a input global or beam irradiation values collected by pyranometer and pyreliometersensors, respectively. This way, a practical tool was obtained. Such tool uses data collected by low costsensors to perform an initial statistical study about days and hours when there is a higher level ofirradiation. Therefore, this information can be used to optimize the solar power capture. The irradiationtransition identification algorithm, generally, had a better compilance at peaks hours, where for the samedays it reached ranging around 100% and 87.10% using the global and beam components as input to thestandard algorithm, respectively. From the results, it is clears that a better performance of the irradiationtransition identification algorithm when using global irradiation values as input to the standardalgorithm, as well as a lower compilance of the irradiation transition algorithm during the dawn andtwilight periods. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6913 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6913/5941

oai:publicacoes.softaliza.com.br:article/6914 2024-08-26T11:31:55Z cilamce2019:ART

GENETIC ALGORITHMS TO DETERMINE THE OPTIMAL PARAMETERS OF AN ENSEMBLE LOCAL MEAN DECOMPOSITION Willian T. F. D. Silva Filipe D. D. M. Borges ensemble local mean decomposition genetic algorithms signal processing optimization An optimization method for an ensemble local mean decomposition (ELMD) parameters selection was proposed by using evolutionary algorithms. ELMD is an adaptive, non-stationary and non-linear signal processing method based on the addition of different white noises to the target signal to be decomposed into a local mean decomposition (LMD) in order tosolve its large mode mixing problem. Even though it has satisfactory performance for faultdiagnosis of rotating machinery and reduced maintenance costs, the execution of this techniquedepends heavily on the correct choice of the parameters of its model. Although it was proposedto optimize the selection of these parameters through relative root-mean-square error (RRMSE)and signal-to-noise ratio (SNR), the optimized ensemble local mean decomposition (OELMD)based its selection by testing several values for amplitude, noise bandwidth and ensemble trials inorder to obtain the optimum value. However, even with excellent signal processing results, thistechnique can raise computational costs and become prohibitive, especially in real-time analysis.Thus, this work also proposed an optimized ELMD, but in this occasion using the inclusion ofgenetic algorithms. The effectiveness of the proposed method was evaluated using syntheticsignals, which was used by several authors for such purposes. Despite presenting inferior resultsto OELMD in avoiding mode mixing problem, the suggested algorithm obtained better resultsregarding the signal processing time. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6914 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6914/5942

oai:publicacoes.softaliza.com.br:article/6915 2024-08-26T11:31:55Z cilamce2019:ART

ANALYSIS AND COMPARISON BETWEEN REGRESSION MODELS FOR TEMPERATURE ESTIMATION OF SOLAR COLLECTORS OPERATING WITH NANOFUIDS Juarez Pompeu de Amorim Neto Paulo Alexandre Costa Rocha Felipe Pinto Marinho Ricardo José Pontes Lima Lino Wagner Castelo Branco Portela Maria Eugênia Vieira da Silva Solar Energy Renewable Energy Machine Learning Ridge Regression LASSO The objective of this work is to verify the application of polynomial regression methods,Ridge and Lasso regression in the nowcasting of the fluid temperature and energy gain of a solarcollector operating with nanofluids. The collector has temperature and global/direct solar radiationsensors for data logging. In addition the R programming language was used for the statistical analysisof R2, MAE (Mean Absolute Error) and RMSE (Root Mean Squared Error). The models were appliedin three different data sets, which regarded to the data for water temperature prediction and TiO2nanofluids with a concentration of 25 ppm and 75 ppm, where each method applied seven predictorsfor the fluid temperature nowcasting. The best Root Mean Squared error found in the test sets was2.281°C for a degree 3 polynomial regression, whereas the Ridge presented an RMSE of 3.190°C. TheRidge and the Lasso usually improve least squares methods but they did not perform well in this dataset, the Ridge regression considered a model with all the predictors and got a high test error, as far asthe Lasso excluded some predictors and got an improved result. A cross-validation was performed toknow the degree of the most effective polynomial for the analysis of these data and the polynomialregression of degree 3 obtained the best result, confirming that the fluid temperature does not follow alinear trend mainly during the hours from 5:30 to 21:30. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6915 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6915/5943

oai:publicacoes.softaliza.com.br:article/6916 2024-08-26T11:31:55Z cilamce2019:ART

DATABASE TO SUPPORT ENERGY PLANNING APPLICATIONS Karen, F. de Paula Alan, A. da Silva Thassius, C. M. Oliveira Roberto, Asano Jr. Jose, F. Toledo Patricia, T. L. Asano Database Energy Planning Hydrothermal Systems Currently, obtaining updated real data for analyzes related to the generation of hydroelectricand thermoelectric energy in Brazil is only accessible through the database provided by the NationalSystem Operator (ONS), by means of a file package used in the computational model NEWAVE (Longand Medium Term Interconnected Hydrothermal Systems Operation Planning Model). NEWAVE wasdeveloped to determine the optimal operation policy for the hydrothermal power system, but workingwith this information in a direct way is practically impossible, which makes it difficult to carry out newstudies by industry and academia. Opposing this difficulty, researchers at the Laboratory of Technologiesand Bioinspired Solutions of the Federal University of ABC (LabBITS) implemented an open platformfor general access of the information of the Brazilian electric power generation system, where the mainobjective was to concatenate all the information to foment the studies with different operative scenariosreferring to the energetic planning in Brazil. The data is constantly updated with files from the ElectricEnergy Trading Chamber (CCEE) database. The data was reorganized through JAVA programminglanguage and was recorded in a new single database with MySQL as a template, to facilitate the readingand recording of study’s input data and results. From this organization, a visual query platform is beingdeveloped to support the development of modules for the determination of optimal generation within abioinspired computational platform called Energ.IA. 1 XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6916 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6916/5944

oai:publicacoes.softaliza.com.br:article/6917 2024-08-26T11:31:54Z cilamce2019:ART

CONSTRUÇÃO DE REDE DE INFLUÊNCIAS VIA GRAFO DE VISIBILIDADE HORIZONTAL Rabelo, A. F. C. Dias, T. M. R. Moita, G. F. Redes de Influência Grafo de Visibilidade Horizontal Sistemas Estocásticos Sistemas Caóticos Redes de influências são capazes de identificar relações intrínsecas entre elementos distintosem um universo. O método chamado de Grafo de Visibilidade Horizontal (Horizontal Visibility Graph– HVG), tem como função transformar uma série temporal em um grafo. Atualmente, este método podeser utilizado para estudar diversos sistemas dinâmicos. Pode ser utilizado também, como ferramenta dedistinção entre sistemas caóticos e estocásticos. Neste artigo, os autores propõem a construção de umarede de influência, baseada nas variações diárias das moedas mundiais. Para tanto, analisou-se estesistema de natureza estocástica, utilizando quantificadores tradicionais de redes, por meio dos quais foipossível a distinção entre os diferentes graus de estruturas de correlação. Por fim, apresentamos a redegerada a partir das séries temporais do Movimento Browniano Fracionário, comparando os resultadoscom a distribuição da distância e do grau de elementos da rede. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6917 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6917/5945

oai:publicacoes.softaliza.com.br:article/6918 2024-08-26T11:31:54Z cilamce2019:ART

DETERMINATION OF IDF CURVE: COMPARATIVE STUDY BETWEEN THE BELL METHOD AND RAINFALL EQUATION IN THE CITY OF BREVES, PARÁ Giulianna T. A. Listo Vanessa M. Barbosa Jaqueline dos S. Santos Rodrigo S. S. Rodrigues IDF Curves Bell Method Equation of heavy rains Breves Urban drainage systems are often planned and designed using rainfall intensity equations.These equations allow to estimate the maximum precipitation of heavy rainfall and may be obtainedthrough different methods based on the correlation of a few rainfall data, such as its duration, frequencyand distribution. One of those is the Bell’s method, used in this paper. However, the lack of pluviographrecords as well as short duration data in certain areas have pointed out to the use of pluviometry registersand statistical models as alternatives to assist the design of drainage infrastructure. This paper aims toinvestigate and compare the performances of the Bell’s method and the rainfall equation proposed bySouza et al. (2012) for the city of Breves, in the State of Pará, Brazil. The study was carried out mostlyby the processing of rainfall data repositories of three meteorological stations situated in Breves usingperiods of observation of 8, 11 and 26 years and its statistical analysis. The results obtained showed thatthe Bell methodology and the intense rainfall equation for the estimation of maximum rainfall with smallreturn periods is applicable and consistent, considering the use of a large data series. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6918 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6918/5946

oai:publicacoes.softaliza.com.br:article/6919 2024-08-26T11:31:54Z cilamce2019:ART

DYNAMIC ANALYSIS OF PLANE STRESS PROBLEMS BY THE HIERARCHICAL FINITE ELEMENT METHOD WITH THE USE OF ERROR INDICATORS FOR SELECTIVE MESH ENRICHMENTS Carolina C. Cittadin Marcos Arndt Finite element method Selective mesh refinement Friberg indicator The search for optimized projects has led to the design of leaner and lighter structures, whichare more susceptible to dynamic effects. These must be thoroughly analyzed in order to avoid excessivedisplacements, structural damage and to guarantee user comfort. However, the analytic solution ofdynamic problems tends to present great difficulties and, in some cases, cannot be obtained. Therefore,researchers developed approximated methods. The most used approximated method is the FiniteElement Method (FEM). As a well-established method, the main focus of FEM studies has shifted fromthe development of the method to the improvement of its results. In this context two lines of researchhave proven to greatly influence the accuracy and efficiency of the method, the study of refinementsand the study of error indicators. Even though refinements improve the accuracy of solutions they canlead to greater computational efforts and complexity. A way to balance these drawbacks is to combinethem with error indicators. These allow the engineer to specify which mesh elements have greaterinfluence on the results and apply refinements selectively. The present study focuses on precisely these characteristics and evaluates the use of the Friberg Error Indicator in the dynamic analyses of two-dimensional structures as a mean to the application of a selective p-refinement. Numerical examples, considering plane stress state, are computationally modeled with the use of Lobatto’s hierarchical shapefunctions and trigonometrical enrichments. The results of eigenvalues for the enrichment of differentelements are compared with those present in past literature. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6919 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6919/5947

oai:publicacoes.softaliza.com.br:article/6920 2024-08-26T11:31:53Z cilamce2019:ART

APPLICATION OF THE GENERALIZED FINITE ELEMENT METHOD TO THE FIRST ORDER SHEAR DEFORMATION THEORY APPLIED TO ISOTROPIC AND SANDWICH PLATES UNDER LARGE DISPLACEMENTS Wellington Rhoden de Lemos Paulo de Tarso Rocha de Mendonça Stress recovery Post-processing Layered composite structures This paper presents a procedure to extract accurate transverse normal and shear stresses, andthe transverse and in-plane displacements, in isotropic plates, symmetric laminated composite plates andplates with sandwich structure, modeled by the First Order Shear Deformation Theory (FSDT), underlarge displacements considered in the von Kármán sense. The Generalized Finite Element Method(GFEM) is used, in which the enrichment of the Partition of Unity (PoU) functions is done by completepolynomials functions, improving the obtained results, and making it possible to obtain basis ofapproximate functions with degree 4 of polynomial reproducibility. This makes possible to obtainstraightforwardly the third derivatives of transverse displacement w, which is needed in most extractionprocedures based on the integration of the local equilibrium and kinematic equations. The procedurestarts with the integration of the local differential equations static equilibrium, using the results obtainedfrom the direct calculations of stresses and displacements by the constitutive equations using the resultsof the GFEM. Modifications of the stresses at given integration points are performed to enforce thefollowing conditions: (a) the satisfaction of boundary conditions on both faces of the laminate, (b)equivalence with the resultant shear forces, and (c) interlaminar continuity of stresses. The transverse and in-plane displacements are integrated along the thickness using the three-dimensional local stress-strain relations for anisotropic layers. The stresses and deflections calculated with the proposed post-processing are compared with the stresses and deflections obtained in the literature or calculated using a three-dimensional Finite Element (FEM) analysis that serves as a reference. The proposed stressrecovery procedure, when applied to geometrically nonlinear problems, generate estimates that show agood correlation with the three-dimensional FEM reference solutions and with the solutions present inthe literature, for all test cases of isotropic, laminated plates and sandwich plates. For the displacementsalong the thickness the results are satisfactory, considering that the solution comes from a first ordermodel. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6920 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6920/5948

oai:publicacoes.softaliza.com.br:article/6921 2024-08-26T11:31:53Z cilamce2019:ART

INTEGRAÇÃO NUMÉRICA NO CONTEXTO DO MÉTODO DOS ELEMENTOS FINITOS GENERALIZADOS THE NUMERICAL INTEGRATION IN GFEM ANALYSIS Bruna C. Campos Felício B. Barros Samuel S. Penna Generalized Finite Element Method Fracture mechanics Numerical integration Structural problems involving variables with a quick change in a small scale of a certain do-main requires a numerical approach which considers discontinuities, singularities and high gradients. Fracture Mechanics problems are an example of this kind, considering its process of evaluation of cracknucleation and propagation. Using the conventional Finite Element Method (FEM) for modelling this type of situation may be time spending and not achieve great precision due to remeshing and inexact nu-merical integration. An alternative approach is the Generalized Finite Element Method (GFEM), which associates FEM with enrichment functions in local regions of the problem. In this paper it is evalu-ated some strategies for GFEM numerical integration, allowing the representation of non-polynomial enrichment functions – frequently seen in GFEM for crack modelling – to be more precise with lessprocessing time when compared to those results obtained with conventional Gauss quadrature rule. The computational analysis is inserted on the open source software INSANE (Interactive Structural Analy-sis Environment), developed by the Structural Engineering Department of Federal University of Minas Gerais. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6921 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6921/5949

oai:publicacoes.softaliza.com.br:article/6922 2024-08-26T11:31:53Z cilamce2019:ART

VIRTUAL ELEMENT METHOD VS FINITE ELEMENT METHOD FOR PRANDTL’S SOLUTION OF ST. VENANT TORSION PROBLEM Tiago Fernandes Moherdaui Alfredo Gay Neto Virtual element method Finite element method This work presents a comparison of the novel virtual element method and the traditional finiteelement method for Prandtl’s solution to the St. Venant torsion problem. The solved field is the Prandtlfunction for a given cross-section that experiences torsion. This function is approximated using bothmethods with a collection of different meshes. These meshes vary in properties such as the element size,geometry (Delaunay triangulations and Voronoi tessellations are employed), and polynomial order(linear and quadratic elements). The numerical error measurement is based on the torsion constant, aglobal scalar associated with the solution, with physical significance for the problem. Two differentcross-sections with analytical solutions are used as benchmarks. The results are presented in a set ofconvergence curves for each cross-section geometry. The virtual element method showed moreversatility regarding element geometry, while retaining the same convergence properties of the finiteelement method. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6922 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6922/5950

oai:publicacoes.softaliza.com.br:article/6924 2024-08-26T11:31:53Z cilamce2019:ART

THE TRIGONOMETRIC WAVELET FINITE ELEMENT METHOD APPLIED TO FREE VIBRATION ANALYSIS OF EULER-BERNOULLI BEAMS Thamara Petroli Marcos Arndt Roberto Dalledone Machado Wavelets Finite Element Method Dynamic Analysis Over the past years several numerical methods have been formulated so as to not only find thenumerical solution of a mathematical model that describes a phenomenon, but also to find this solutionin the fastest way, with low computational cost and especially, in the most accurate way. One of thecharacteristics of the enriched methods based on the Finite Element Method (FEM) is the possibility ofincluding new shape functions, which are not necessarily polynomial, in the approximate solution space.The Wavelet Finite Element Method (WFEM) is an example of an enriched method that seeks to findnumerical solutions to engineering problems using the adaptability that Wavelet functions present. TheWFEM is the combination of FEM and Wavelets. WFEM uses the so-called scaling functions as shapefunctions, whose linear combination, using the FEM techniques, will describe the approximate solutionspace. In this sense, the objective of this work is to study the use of trigonometric Wavelets as enrichmentfunctions in WFEM for dynamic analysis of structures, seeking to combine the high convergence ratesof enriched methods with the trigonometric Wavelet properties. In this work the trigonometric WFEMmethod is applied to free vibration analysis of Euler Bernoulli beams in order to verify its efficiency indynamic analysis. The natural frequencies obtained by the WFEM are compared with those obtainedfrom analytical solutions and by other numerical methods such as the traditional FEM. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6924 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6924/5951

oai:publicacoes.softaliza.com.br:article/6925 2024-08-26T11:31:52Z cilamce2019:ART

DYNAMIC ANALYSIS OF THICK CURVED BEAMS WITH THE GENERALIZED FINITE ELEMENT METHOD Ramon Macedo Correa Marcos Arndt Roberto Dalledone Machado Thick Curved Beams Dynamic Analysis Generalized Finite Element Method The traditional Finite Element Method (FEM) is widely applied in the dynamic analysis of structures, but, mostly, for higher frequencies, a great computational effort is required. In order to de-crease this computational effort, the Generalized Finite Element Method (GFEM) arise as an alternative. The GFEM is based on the Partition of Unity Method and it has as its main characteristic the ability to incorporate aspects of the problem solution into the approximation space, which may decrease the com-putational effort involved. The curved beam element has received much attention from researchers for two main reasons: firstly, because it is a very efficient structural element that can span large distances;and secondly because it provides insight into various aspects of shell element behavior. The curved beamelement is very sensitive to membrane and shear locking. In order to avoid these issues, trigonometricfunctions are used to expand the traditional FEM approximation space using the GFEM approach. In thispaper the application of the GFEM for modal and transient analysis of thick curved beams is proposed.The GFEM results are compared to reference solutions found in literature and traditional FEM results. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6925 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6925/5952

oai:publicacoes.softaliza.com.br:article/6926 2024-08-26T11:31:52Z cilamce2019:ART

COMPARATIVE ANALYSIS OF TRIGONOMETRIC ENRICHMENTS USED IN DYNAMIC ANALYSIS OF TIMOSHENKO BEAMS BY THE GENERALIZED FINITE ELEMENT METHOD Patrícia L. M. Freisleben Paulo de Oliveira Weinhardt Marcos Arndt Roberto Dalledone Machado Generalized Finite Element Method Timoshenko beams trigonometric enrichments dynamic analysis The Finite Element Method (FEM) is widely used in the dynamic analysis of structures, how-ever it has some limitations. In order to improve the numerical response, enriching functions can be incorporated to FEM approximation space using the Generalized Finite Element Method (GFEM) pro-cedure. Several studies have already been carried out to prove the efficiency of GFEM in the dynamic analysis of bars, Euler-Bernoulli beams, trusses, among other structural elements, but few studies haveinvestigated the application of GFEM in the dynamic analysis of Timoshenko beams. The present workaims to contribute to this field presenting modal and transient analyses of Timoshenko beams using theGFEM technique. Three different trigonometric enrichments are used to perform modal and transientanalyses of Timoshenko clamped-free beams without damping and the results are compared with those obtained by FEM. The normalized spectrum is obtained by the modal analysis and displacements, ve-locities and accelerations of the beam along the time are also calculated by transient analysis. In that manner the efficiency of each GFEM enrichment in modal and transient analysis of Timoshenko beamsis discussed. XL Ibero-Latin American Congress on Computational Methods in Engineering 2024-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2019/article/view/6926 XL Ibero-Latin American Congress on Computational Methods in Engineering; v. 1 n. 01 (2019): CILAMCE 2019 por https://publicacoes.softaliza.com.br/cilamce2019/article/view/6926/5953 6f2f48e5826bae6bfca1c78d162df02d