Porous materials are widely used as effective sound absorbers in both industrial as well as in architectural applications. In most cases, the frame of the porous materials is not rigid. It is well-known that Biot's theory models effectively the behaviour of such materials. Analytical solutions to Biot's theory are restricted to simpler geometrical shapes. In the present paper, a finite elemnt method based on the Galerkin approach is presented to model the poro-elastic medium and its interactions with elstic medium as well as surrounding fluid medium. The boundary conditions are effectively brought out in the process. Modelling the interaction between two porous layers is also discussed in the present paper. Finally, comparisons are made with the analytical solutions exisiting in the literature for both normal as well as oblique incident plane waves.
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