Monday, November 29, 2010 - 3:00pm - 3:45pm
Martin Gander (Universite de Geneve)

In contrast to the positive definite Helmholtz equation, the

deceivingly similar looking indefinite Helmholtz equation is difficult

to solve using classical iterative methods. Applying directly a Krylov

method to the discretized equations without preconditioning leads in

general to stagnation and very large iteration counts. Using classical

incomplete LU preconditioners can even make the situation worse.

Classical domain decomposition and multigrid methods also fail to

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