Abstract
An overset grid methodology is developed for the fully coupled analysis of fluid-structure interaction (FSI) problems. The overset grid approach alleviates some of the computational geometry difficulties traditionally associated with Arbitrary-Lagrangian-Eulerian (ALE) based, moving mesh methods for FSI. Our partitioned solution algorithm uses separate solvers for the fluid (finite volume method) and the structure (finite element method), with mesh motion computed only on a subset of component grids of our overset grid assembly. Our results indicate a significant reduction in computational cost for the mesh motion, and element quality is improved. Numerical studies of the benchmark test demonstrate the benefits of our overset mesh method over traditional approaches.
Highlights
We present a fully-coupled, arbitrary Lagrangian-Eulerian (ALE) fluid-structure interaction (FSI) algorithm that uses overset meshes [1] [2] around moving bodies to alleviate the difficulties and computational costs associated with moving mesh algorithms
We have developed and demonstrated an FSI simulation method based on the ALE formulation of the governing equations
Our partitioned algorithm allows for the modular introduction of separate, optimized fluid and structural solvers that are joined by a custom framework to pass information between them and perform the necessary mesh motion
Summary
We present a fully-coupled, arbitrary Lagrangian-Eulerian (ALE) fluid-structure interaction (FSI) algorithm that uses overset meshes [1] [2] around moving bodies to alleviate the difficulties and computational costs associated with moving mesh algorithms. The fluid domain is comprised of a stationary background mesh and body-fitted overset meshes for the structural components. It is only these overset meshes that need to be modified in a mesh motion procedure. (2014) An Overset Grid Method for Fluid-Structure Interaction. We study the benefits associated with the use of overset grids for FSI computations and compare with a standard approach within a single software framework. The benchmark problem of Turek and Hron [3] is used to demonstrate the method and showcase the improvements that overset grids can offer
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