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document
Erlangga, Y.A. (author), Vuik, C. (author), Oosterlee, C.W. (author)
report 2003
document
van Gijzen, M.B. (author), Erlangga, Y.A. (author), Vuik, C. (author)
Shifted Laplace preconditioners have attracted considerable attention as a technique to speed up convergence of iterative solution methods for the Helmholtz equation. In this paper we present a comprehensive spectral analysis of the Helmholtz operator preconditioned with a shifted Laplacian. Our analysis is valid under general conditions. The...
report 2006