A novel approach to fluid-structure interaction simulations involving large translation and contact

TL;DR

This paper introduces the PD-DMUM, a new mesh update method for fluid-structure interaction simulations that avoids remeshing during large boundary displacements by combining two mesh adaptation techniques.

Contribution

The paper presents the PD-DMUM, a novel mesh update method that integrates virtual ring shear-slip and elastic mesh update techniques to handle large boundary movements without remeshing.

Findings

Validated in 2D Poiseuille flow with moving boundaries

Successfully applied to fluid-structure interaction case

Demonstrated advantages over traditional mesh update methods

Abstract

In this work, we present a novel method for the mesh update in flow problems with moving boundaries, the phantom domain deformation mesh update method (PD-DMUM). The PD-DMUM is designed to avoid remeshing; even in the event of large, unidirectional displacements of boundaries. The method combines the concept of two mesh adaptation approaches: (1) The virtual ring shear-slip mesh updatemethod (VR-SSMUM); and (2) the elastic mesh update method (EMUM). As in the VR-SSMUM, the PD-DMUMextends the fluid domain by a phantom domain; the PD-DMUM can thus locally adapt the element density. Combined with the EMUM, the PD-DMUMallows the consideration of arbitrary boundary movements. In this work, we apply the PD-DMUM in two test cases. Within the first test case, we validate the PD-DMUM in a 2D Poiseuille flow on a moving background mesh. Subsequently the fluid-structure interaction (FSI) problem in the second test case serves as a proof of concept. More, we stress the advantages of the novel method with regard to conventional mesh update approaches.