Vortex Shedding by LES 3D Numerical Simulation
Marcela Lima Santos1; Michèle Schubert Pfeil2; Alvaro Luiz Gayoso de Azeredo Coutinho3
1 Programa de Engenharia Civil - COPPE/UFRJ / Instituto Multidisciplinar - UFRRJ; 2 Programa de Engenharia Civil - COPPE/UFRJ; 3 Programa de Engenharia Civil - NACAD/COPPE/UFRJ
doi:10.20906/CPS/CILAMCE2017-0785
Resumo
Slender tower and chimney structures usually have uniform or tapered cylinder cross-section and may display significant wind induced vibrations due to vortex shedding. It is of fundamental importance to understand how the flow develops around the structure. In this perspective, the present study focuses on the numerical simulation of the flow around fixed rigid tower structures for which experimental results from wind tunnel tests are available in the literature for both uniform and shear wind velocity profiles at high Reynolds numbers. The solution of the incompressible Navier-Stokes equations is obtained by 3D computational fluid dynamic (CFD) in tetrahedral elements, considering Smagorinsky's LES turbulence model. The main goal of the analyses is to validate the numerical models, in order to allow future numerical studies on the influence of turbulence on the behavior of towers and chimneys under the action of wind. The results were very satisfactory, ensuring the adequacy of the developed models.
Palavras-chave: Computational Fluid Dynamic; Vortex Shedding; Uniform and Tapered Cylinder; 3D Numerical Simulation