A domain decomposition solver for acoustic scattering by elastic objects in layered media

被引：25

作者：

Ito, Kazufumi ^{[1
]}

Qiao, Zhonghua ^{[1
]}

Toivanen, Jari ^{[1
]}

机构：

[1] N Carolina State Univ, Ctr Res Sci Computat, Raleigh, NC 27695 USA

来源：

JOURNAL OF COMPUTATIONAL PHYSICS | 2008年 / 227卷 / 19期

基金：

芬兰科学院; 美国国家科学基金会;

关键词：

fast Helmholtz solver; scattering from elastic targets; domain decomposition preconditioner;

D O I：

10.1016/j.jcp.2008.06.015

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

A finite element solution procedure is presented for accurately computing time-harmonic acoustic scattering by elastic targets buried in sediment. An improved finite element discretization based on trilinear basis functions leading to fourth-order phase accuracy is described. For sufficiently accurate discretizations 100 million to I billion unknowns are required. The resulting systems of linear equations are solved iteratively using the GMRES method with a domain decomposition preconditioner employing a fast direct solver. Due to the construction of the discretization and preconditioner, iterations can be reduced onto a sparse subspace associated with the interfaces. Numerical experiments demonstrate capability to evaluate the scattered field with hundreds of wavelengths. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：8685 / 8698

页数：14

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