Técnica de Movimentação e Suavização de Malha Baseada na Teoria da Elasticidade Linear Aplicada ao Acoplamento Fluido-Estrutura
Palavras-chave:
fluid structure interaction, mesh movement, incompressible flow, linear elasticity model, vortex induced vibrations.Resumo
Fluid-Structure coupled problems are of great interest in industry, such as aeronautics, naval, oil, etc. In
this kind of phenomena, interaction between different physics occur, therefore they cannot be analyzed separately.
The great challenges in analysis of problems involving FSI is the fact that the computational mesh that discretizes
the fluid domain, undergoes major deformations caused by displacements and/or structural deformations. An
Arbitrarian Lagrangian-Eulerian discretization is used, considering the computational mesh as a physical field.
Additionally, it is necessary to have an adequate treatment so that the computational mesh absorbs these
movements, avoiding excessive deformations. In this work, a mesh movement and smoothing technique is
analyzed, where each element of the mesh can be considered as a deformable structure, with the local Young
module defined in terms of the characteristic length of the element. Furthermore, an edge swap technique was
implemented, which associated with a mesh movement technique allows great structural displacements. Here the
fluid is incompressible, and structure is a rigid body. The study of parameters was performed, considering the
stiffness of the elements, so that there can be large displacements of the structure without excessive mesh
deformation and quality decrease of the elements. Validation results were obtained.
