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Robin boundary conditions are a natural consequence of employing Nitsche'smethod for imposing the kinematic velocity constraint at the fluid-solidinterface. Loosely-coupled FSI schemes based on Dirichlet-Robin or Robin-Robincoupling have been demonstrated to improve the stability of such schemes withrespect to added-mass. This paper aims to offer some numerical insights intothe performance characteristics of such loosely-coupled FSI schemes based onRobin boundary conditions. Using numerical examples, we demonstrate that theimproved stability due to the added damping term is actually at the expense ofimportant dynamic characteristics of the structural sub-problem.

Insights into the performance of loosely-coupled FSI schemes based on Robin boundary conditions