BEM and FEM Analysis of the Fluid-Structure Interaction in Tanks with Baffles

BEM and FEM Analysis of the Fluid-Structure Interaction in Tanks with Baffles

Gnitko, V. Degtyariov, K. Naumenko, V. Strelnikova, E. Podgorny, A.N.

Institute for Mechanical Engineering Problems of the Ukrainian Academy of Sciences, Ukraine.

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In this paper we consider vibrations of the baffled elastic fuel tank partially filled with a liquid. The compound shell was a simplified model of a fuel tank. The shell is considered to be thin and the Kirchhoff–Love linear theory hypotheses are applied. The liquid is supposed to be an ideal and incompressible one and its flow introduced by the vibrations of a shell is irrotational. The problem of the fluid-structure interaction was solved using the reduced boundary and finite element methods. The tank structure was modeled by the FEM and the liquid sloshing in a fluid domain was described by using the multi-domain BEM. The rigid and elastic baffled tanks of different forms were considered. The dependencies of frequencies via the filling level were obtained numerically for vibrations of the fluid-filled tanks with and without baffles.


baffles, fluid-structure interaction, free vibrations, liquid sloshing, multi-domain boundary element method, systems of singular integral equations


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