The aim of this subject is to predict numerically the aeroelastic behavior of bridges. This work deals with approximation of the interaction of two-dimensional incompressible viscous fluid and a vibrating bridge section. In this study we present an efficient algorithm aiming to predict the dynamic coupled behavior of structures in high-speed turbulent wind flows. To mathematically describe the fluid flow in computational deformed domain due to bridge section motion, we use the Navier-Stokes equations in the arbitrary Lagrangian-Eulerian (ALE) description. A numerical scheme used for unsteady flow simulations is implemented in a form satisfying the geometric conservation law (GCL). For turbulence modeling, we adopt the Large Eddy Simulation (LES) method using the Smagorinsky model. The structure sub-system is modeled as a spring supported rigid body. The resulting non-linear strongly coupled system is solved by the use of finite element method and a relaxed Bloc Gauss-Seidel method. The obtained results for different Reynolds numbers -for flow around sections of bridges and the aeroelastic response of the solid structure- show a good agreement with available experimental and numerical results.
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