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Coupling of Elastic Solids with Compressible Two-Phase Fluids for the Numerical Investigation of Cavitation Damaging

Wednesday 26 June 2013, by Dickopp Christian, Gartz Roman, Müller Siegfried

Abstract Cavitation damaging is investigated by simulation of the model problem of a single gas bubble in a compressible liquid collapsing near the surface of an elastic solid wall. The three-phase system is described by the com- pressible Euler equations supplemented by the stiffened gas law for both fluids, a non-conservative evolution equation for the gas fraction charac- terizing the liquid-gas interface and the elastodynamical equations for a linear-elastic solid. The fluid model and the solid model are coupled by transition conditions at the fluid-structure interface. The fluid equations are discretized according to Saurel and Abgrall and for the elastodynamical equations a finite volume discretization is applied. These numerical methods are coupled by a weak coupling strategy. The numerical results exhibit von Schmidt waves in the structure as well as the fluid. As possible explanation for cavitation damaging the von Mises yield criterion is evaluated.

Key words : compressible two-phase flow, linear-elastic solid, weak coupling.

Paper presented by JM Hérard and T. Gallouët on June, 26, 2013

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Administrateur : Fayssal BENKHALDOUN
ISSN 1634-0655
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