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Simulations of a Flexible Cylinder in a Confined Region using a Chimera technique
Lucas Franky Delcour, Jan Vierendeels, Joris Degroote

Last modified: 2018-04-17


Fluid-structure interaction (FSI) simulations involving the motion of flexible structures within confined regions are often hindered by mesh degradation when an arbitrary Lagrangian-Eulerian (ALE) approach is used. In this paper the feasibility of using an overset or Chimera methodology for this kind of simulations is investigated. The overset mesh, surrounding the flexible structure, is superimposed on a fixed background mesh, which covers the entire flow domain. The overset mesh is not confined to the physical fluid domain allowing for larger structural deformations without severe grid degradation.

To assess the limitations and errors associated to the use of an overset grid, simulations in which the structural motion is imposed are performed and, when possible, compared to an arbitrary Lagrangian-Eulerian formulation. The increase in computational cost and memory requirements are also considered. Subsequently, fluid-structure interaction simulations are performed with varying degrees of freedom for the structure.

The flow is calculated based on the compressible Reynolds-averaged Navier-Stokes equations as both high and low Mach number flows are considered. For high Mach number flows, the nozzle geometry used in the fluid-structure interaction simulations is subjected to shocks. The presence of these shocks should be taken into account when constructing the overset grid.


Fluid-Structure Interaction; Chimera; Overset; Computational Fluid Dynamics

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