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

Kazufumi Ito, Zhonghua QIAO*, Jari Toivanen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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 1 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.

Original languageEnglish
Pages (from-to)8685-8698
Number of pages14
JournalJournal of Computational Physics
Volume227
Issue number19
DOIs
Publication statusPublished - 1 Oct 2008

Scopus Subject Areas

  • Numerical Analysis
  • Modelling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

User-Defined Keywords

  • Domain decomposition preconditioner
  • Fast Helmholtz solver
  • Scattering from elastic targets

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