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Prof.dr. C.W. Oosterlee (CWI, Amsterdam and TU Delft)
| Speaker: |
Prof.dr. C.W. Oosterlee
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| Date: |
Wednesday March 11, 2009
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| Title: |
Multigrid
preconditioners for Helmholtz problems
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Abstract
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In
this presentation we will give details about multigrid methods for
Helmholtz problems. The wave problems are characterized by
heterogeneous wavenumber. They arise in seismics and recently we also
work on physics problems.
A preconditioner based on a shifted Laplacian operator with a
complex-valued shift is employed, which is approximately inverted by
multigrid.
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