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An Adaptive Finite Element PML Method for the Acoustic-Elastic Interaction in Three Dimensions

Published online by Cambridge University Press:  31 October 2017

Xue Jiang*
Affiliation:
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Peijun Li*
Affiliation:
Department of Mathematics, Purdue University, West Lafayette, IN 47907, USA
*
*Corresponding author. Email addresses:jxue@lsec.cc.ac.cn(X. Jiang), lipeijun@math.purdue.edu(P. Li)
*Corresponding author. Email addresses:jxue@lsec.cc.ac.cn(X. Jiang), lipeijun@math.purdue.edu(P. Li)

Abstract

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Consider the scattering of a time-harmonic acoustic incident wave by a bounded, penetrable, and isotropic elastic solid, which is immersed in a homogeneous compressible air or fluid. The paper concerns the numerical solution for such an acoustic-elastic interaction problem in three dimensions. An exact transparent boundary condition (TBC) is developed to reduce the problem equivalently into a boundary value problem in a bounded domain. The perfectly matched layer (PML) technique is adopted to truncate the unbounded physical domain into a bounded computational domain. The well-posedness and exponential convergence of the solution are established for the truncated PML problem by using a PML equivalent TBC. An a posteriori error estimate based adaptive finite element method is developed to solve the scattering problem. Numerical experiments are included to demonstrate the competitive behavior of the proposed method.

Information

Type
Research Article
Copyright
Copyright © Global-Science Press 2017