Investigation of SST and LES turbulence models in the analysis of the wind action on a suspension bridge via CFD simulations

Resumo

In recent years, the use of computational techniques for fluid dynamics for the quantitative prediction of
flow characteristics has grown exponentially. With the advance of computational technology, CFD (Computational
Fluid Dynamics) simulation of numerous complex problems in various engineering areas, such as fluid-structure
interaction, became possible. However, some difficulties appear when working with these problems using the
CFD approach. In general, flows are turbulent with high Reynolds numbers, which makes it necessary to use a
turbulence model. Thus, it is very important to use an adequate turbulence model, especially when it is intended to
analyze the dynamic response of the bridge deck, where it is essential to find out the effect of the vortex shedding.
In this sense, the main objective of this work will be to investigate the turbulence models SST and LES via CFD
simulation in fluid-structure problems one way, in order to analyze the behavior of the wind action on a cross
section of suspension bridge. For this, the Strouhal number and the aerodynamic coefficients will be obtained:
drag, lift and moment of the sectional model submitted to a wind flow with a determined velocity and different
angles of attack.