A boundary element method for porous media

This paper deals with a new method for solving coupled acoustical problems such as those arising from the study of insulation panels with porous linings. The main idea is to use the boundary element method (BEM) for modeling porous media in order to simplify problem solving in mid-frequency range. This approach reduces the entire problem to only unknowns on the boundaries. Developments have been oriented in a bi-dimensional formulation with a constant element discretization scheme. A multi-region assembly of porous subdomains and a coupling procedure with structural finite elements complete this approach. Comparisons between the finite element method (FEM) and the present solution (mixed FEM and BEM) show a close agreement. Moreover, the analysis of a multi-layer system through this mixed numerical method results in faster processing time and less memory usage than a conventional full finite element method.

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