Commun. Comput. Phys., 11 (2012), pp. 674-690.


Micro-Differential Boundary Conditions Modelling the Absorption of Acoustic Waves by 2D Arbitrarily-Shaped Convex Surfaces

Helene Barucq 1*, Julien Diaz 1, Veronique Duprat 1

1 INRIA Bordeaux-Sud Ouest, Team-project MAGIQUE-3D; and LMA, CNRS UMR 5142, University of Pau, France.

Received 31 December 2009; Accepted (in revised version) 26 April 2011
Available online 24 October 2011
doi:10.4208/cicp.311209.260411s

Abstract

We propose a new Absorbing Boundary Condition (ABC) for the acoustic wave equation which is derived from a micro-local diagonalization process formerly defined by M.E. Taylor and which does not depend on the geometry of the surface bearing the ABC. By considering the principal symbol of the wave equation both in the hyperbolic and the elliptic regions, we show that a second-order ABC can be constructed as the combination of an existing first-order ABC and a Fourier-Robin condition. We compare the new ABC with other ABCs and we show that it performs well in simple configurations and that it improves the accuracy of the numerical solution without increasing the computational burden.

AMS subject classifications: 35L05

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Key words: Wave equation, micro-local diagonalization, absorbing boundary condition, finite element formulation.

*Corresponding author.
Email: helene.barucq@inria.fr (H. Barucq), julien.diaz@inria.fr (J. Diaz), veronique.duprat@univ-pau.fr (V. Duprat)
 

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