Numerical simulations of wind effects on flexible civil engineering structures
Keywords:
Fluid-structure interaction, wind effects, aeroelastic coefficients, finite elements, ALE formulation, coupling algorithm, torsional flutter,, vortex sheddingAbstract
In this paper, we present the global set of elements required for the numerical simulation of wind effects on elementary bridge profiles, particularly possible aeroelastic instabilities. We also propose a possible methodology which is based on an efficient coupling algorithm, a finite-element solver for three-dimensional incompressible Navier-Stokes equations in a moving domain and a structural solver. The fluid solver is detailed, the emphasis being put on the ALE formulation. Numerical and experimental results are compared for cases with a structural rigid motion. On a rectangle, numerical simulations for forced oscillation (heaving or rotation) are qualitatively correct, rather inaccurate, but in good agreements with free oscillation numerical simulations though. On an H-shaped section close to the Tacoma Narrows bridge profile, numerical results are both qualitatively and quantitatively very satisfactory and promising.
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