Simulating fluid-structure interactions (FSI) using the spectral/hp element method

Jasmine Foo, Brown University

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Fluid-structure interactions occur in many applications including offshore structures, the dynamics of bridges, aeroelastic motion of airplanes, and biological flows. Simlating FSI involves the coupled solution of fluid and solid mechanics equations. In particular, we must address the moving boundary problem. Two approaches to this problem include a boundary mapping method, which is applicable to problems with only one structure in the flow, and the Arbitrary-Lagrangian-Eulerian (ALE) method. We have developed a spectral/hp element method with these formulations. I will present some examples using these methods. Specifically, I will present DNS simulations using the boundary mapping technique of vortex-induced vibrations (VIV) of freely vibrating rigid cylinders in a crossflow. In this problem we are interested in determining which factors affect the wake vortex-mode selection and response of the cylinder. I will discuss the phasing relationships between forces and displacement, correlation lengths of forces along the span, and the dependence of these quantities upon reduced velocity and Reynolds number.

Abstract Author(s): Jasmine Foo