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Finite element computation of three-dimensional elastoacoustic vibrations. (English) Zbl 1235.74267
Summary: The interior elastoacoustic problem in a 3D domain is solved. Displacement variables are used for both the fluid and the solid. To avoid the typical spurious modes of this formulation, a non-standard discretization is used, consisting of classical linear tetrahedral finite element for the solid and Raviart-Thomas elements of lowest order for the fluid. A new unknown is introduced on the interface between solid and fluid to impose the transmission conditions.

74S05 Finite element methods applied to problems in solid mechanics
74H45 Vibrations in dynamical problems in solid mechanics
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