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arXiv · 1808.08758

A Nitsche-based formulation for fluid-structure interactions with contact

Erik Burman·Miguel A. Fernández·Stefan Frei
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Abstract

We derive a Nitsche-based formulation for fluid-structure interaction (FSI) problems with contact. The approach is based on the work of Chouly and Hild [SIAM Journal on Numerical Analysis. 2013;51(2):1295--1307] for contact problems in solid mechanics. We present two numerical approaches, both of them formulating the FSI interface and the contact conditions simultaneously in equation form on a joint interface-contact surface $\Gamma(t)$. The first approach uses a relaxation of the contact conditions to allow for a small mesh-dependent gap between solid and wall. The second alternative introduces an artificial fluid below the contact surface. The resulting systems of equations can be included {in a consistent fashion} within a monolithic variational formulation, which prevents the so-called "chattering" phenomenon. To deal with the topology changes in the fluid domain at the time of impact, we use a fully Eulerian approach for the FSI problem. We compare the effect of slip and no-slip interface conditions and study the performance of the method by means of numerical examples.

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Erik Burman, Miguel A. Fernández, Stefan Frei. 2018-08-27. A Nitsche-based formulation for fluid-structure interactions with contact. https://arxiv.org/abs/1808.08758

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