一种新的包含大平移和接触的流固耦合模拟方法
A novel approach to fluid-structure interaction simulations involving large translation and contact
摘要：
本文提出了一种新的移动边界流动问题的网格更新方法--幻影域变形网格更新方法（PD-DMUM）。PD-DMUM旨在避免重新网格化;即使在边界发生大的单向位移的情况下。该方法结合了两种网格自适应方法的概念：（1）虚拟环剪切滑移网格更新方法（VR-SSMUM）和（2）弹性网格更新方法（EMUM）。与VR-SSMUM一样，PD-DMUM通过体模域扩展了流体域;因此，PD-DMUM可以局部调整单元密度。结合EMUM，PD-DMUM允许考虑任意边界运动。在这项工作中，我们应用PD-DMUM在两个测试用例。在第一个测试案例中，我们验证了PD-DMUM在一个移动的背景网格上的二维Poietille流。随后，第二个测试用例中的流体-结构相互作用（FSI）问题作为概念验证。此外，我们强调的新方法的优点，相对于传统的网格更新方法。
英文摘要：
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.
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