Campuses:

Iterative methods

Wednesday, May 13, 2015 - 3:10pm - 3:35pm
Andrei Constantinescu (École Polytechnique)
Electrical impedance tomography (EIT) is an imaging technique for the reconstruction of objects embedded in a given conductive background medium . Applications range over a broad spectrum such as non-destructive material testing, geophysics landslide identification or tumor detection inmedical imaging.
Friday, January 14, 2011 - 11:00am - 12:00pm
Michael Heroux (Sandia National Laboratories)
After 15-20 years of architectural stability, we are in the midst of a dramatic change in high performance computing systems design. In this talk we discuss the commonalities across the viable systems of today, and look at opportunities for numerical algorithms research and development.
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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