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
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
收藏
页码:8685 / 8698
页数:14
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