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Basics : Strong FSI

This LS-DYNA simulation shows a simple FSI coupling problem using strong FSI. Indeed, the density of the solid and the fluid are very close. Such cases are by definition unstable when using explicit coupling between solid mechanics and a CFD code ('added mass effect'). In order to reduce those instabilities, strong fluid structure interaction is needed. In order for this to be possible, both solvers need to advance at the same time thus making the use of the implicit solver for solids mandatory.