Solution of the three-dimensional Helmholtz equation using ... - cerfacs

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Motivations Wave propagation modelling Solution method components: Iterative method and multigrid Solution strategy Numerical experiments Perspectives and conclusions Three-dimensional problems BLUE GENE/L machine at CERFACS Configuration 1024 bi-processor nodes. Processors: Power PC440 700 Mhz. Memory: 512 Mbytes per processor. Used with 1GB memory per processor. 22/27 Multigrid for geophysics applications
Motivations Wave propagation modelling Solution method components: Iterative method and multigrid Solution strategy Numerical experiments Perspectives and conclusions Direct method on the coarse grid Three-dimensional problems Experiments on 128 processors Distributed MUMPS implementation [Amestoy et al, 2000]. k Grid 30 45 60 90 64 3 7 96 3 6 8 128 3 5 6 8 192 3 5 5 6 9 Table: Iterations of FGMRES(5) versus grid sizes and wavenumbers Problem gets harder with increasing wavenumbers on a fixed grid [Elman, 2001]. Slight increase of the iterations when kh = constant (diagonal). 23/27 Multigrid for geophysics applications
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Page 3 and 4: Motivations Wave propagation modell
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Solution of the three-dimensional Helmholtz equation using ... - cerfacs

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