Record number :
942355
Title of article :
On a class of preconditioners for solving the Helmholtz equation Original Research Article
Author/Authors :
Y.A Erlangga، نويسنده , , C Vuik، نويسنده , , C.W. Oosterlee، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
17
From page :
409
To page :
425
Abstract :
In 1983, a preconditioner was proposed [J. Comput. Phys. 49 (1983) 443] based on the Laplace operator for solving the discrete Helmholtz equation efficiently with CGNR. The preconditioner is especially effective for low wavenumber cases where the linear system is slightly indefinite. Laird [Preconditioned iterative solution of the 2D Helmholtz equation, First Yearʹs Report, St. Hughʹs College, Oxford, 2001] proposed a preconditioner where an extra term is added to the Laplace operator. This term is similar to the zeroth order term in the Helmholtz equation but with reversed sign. In this paper, both approaches are further generalized to a new class of preconditioners, the so-called “shifted Laplace” preconditioners of the form Δφ−αk2φ with View the MathML source. Numerical experiments for various wavenumbers indicate the effectiveness of the preconditioner. The preconditioner is evaluated in combination with GMRES, Bi-CGSTAB, and CGNR.
Journal title :
Applied Numerical Mathematics
Serial Year :
2004
Link To Document :
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