finite element analysis fluid-structure interaction isogeometric analysis hyperelastic material solid mechanics elastoplastic material computational fluid dynamics immersed boundary method check valve staggered scheme ball valve abaqus ansys hypermesh bezier elements mixed formulation elastodynamics explicit scheme structural dynamics wave propagation stress fsi cfd relief valve inf-sup condition cooks membrane lbb stability lbb condition nurbs two-scale relation b-splines fem strip footing lbb issue fluid flow galloping sedimentation monolithic scheme
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