Evolution of a semidiscrete system modeling the scattering of acoustic waves by a piezoelectric solid

Brown, Thomas S.; Sánchez-Vizuet, Tonatiuh; Sayas, Francisco-Javier

ESAIM: Mathematical Modelling and Numerical Analysis , Tome 52 (2018) no. 2, pp. 423-455.

We consider a model problem of the scattering of linear acoustic waves in free homogeneous space by an elastic solid. The stress tensor in the solid combines the effect of a linear dependence of strains with the influence of an existing electric field. The system is closed using Gauss’s law for the associated electric displacement. Well-posedness of the system is studied by its reformulation as a first order in space and time differential system with help of an elliptic lifting operator. We then proceed to studying a semidiscrete formulation, corresponding to an abstract Finite Element discretization in the electric and elastic fields, combined with an abstract Boundary Element approximation of a retarded potential representation of the acoustic field. The results obtained with this approach improve estimates obtained with Laplace domain techniques. While numerical experiments illustrating convergence of a fully discrete version of this problem had already been published, we demonstrate some properties of the full model with some simulations for the two dimensional case.

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