A HIGH-ORDER DISCONTINUOUS GALERKIN METHOD FOR THE PORO-ELASTO-ACOUSTIC PROBLEM ON POLYGONAL AND POLYHEDRAL GRIDS

The aim of this work is to introduce and analyze a finite element discontinuous Galerkin method on polygonal meshes for the numerical discretization of acoustic waves propagation through poroelastic materials. Wave propagation is modeled by the acoustics equations in the acoustic domain and the low-frequency Biot's equations in the poroelastic one. The coupling is realized by means of (physically consistent) transmission conditions, imposed on the interface between the domains, modeling different pores configurations. For the space discretization we introduce and analyze a high-order discontinuous Galerkin method on polygonal and polyhedral meshes, which is then coupled with Newmark-\beta time integration schemes. A stability analysis for both the continuous and the semidiscrete problems is presented, and error estimates for the energy norm are derived for the semidiscrete one. A wide set of numerical results obtained on test cases with manufactured solutions are presented in order to validate the error analysis. Examples of physical interest are also presented to investigate the capability of the proposed methods in practical scenarios.