# Numerical investigation on tornado-like flows and immersed bodies using vortex models

## Palavras-chave:

Computational Wind Engineering (CWE), Finite Element Method (FEM), Large Eddy Simulation (LES), Tornado flows, Vortex models## Resumo

A study on the characteristics of real and experimentally simulated tornado flows is carried out in this

work using a numerical formulation based on the model of Vatistas et al. [1]. The flow governing equations are

discretized using an explicit two-step Taylor-Galerkin scheme and a finite element formulation is used for spatial

discretization, where eight-node hexahedral elements with reduced integration are used. Tornado flow fields are

reproduced numerically from a velocity profile model by Vatistas et al. [1], where time-dependent boundary

conditions are used to account for tornado vortex translation. Turbulence modeling is performed using Large

Scale Simulation (LES) with the Smagorinsky sub-grid scale model and the computational code is parallelized

using CUDA FORTRAN directives for processing on graphics cards. An experimentally generated tornado flow

field is reproduced using the model implemented here and a cubic building model subjected to different tornado

flow conditions is also analyzed. Results demonstrate that the velocity profile models are able to satisfactorily

reproduce the tornado flow fields and the corresponding aerodynamic forces on immersed bodies.