Solving generalized eigenvalue problems on the interfaces to build a robust two level FETI method

Nicole Spillane (1, 2) , Victorita Dolean (3) , Patrice Hauret (2) , Frédéric Nataf (1) , Daniel Rixen (4)

1 LJLL - Laboratoire Jacques-Louis Lions
2 Centre de Technologie de Ladoux
3 JAD - Laboratoire Jean Alexandre Dieudonné
4 Institute of Applied Mechanics [Garching]

FETI is a very popular method which has proved to be extremely efficient on many large scale industrial problems. One drawback is that it performs best when the decomposition of the global problem is closely related to the parameters in equations. This is somewhat confirmed by the fact that the theoretical analysis goes through only if some assumptions on the coefficients are satisfied. We propose here to build a coarse space for which the convergence rate of the two level method is guaranteed regardless of any additional assumptions. We do this by identifying the problematic modes using generalized eigenvalue problems.

Mots clés: Domain decomposition; FETI; BDD; robustness; scalability; varying coefficients; irregular partitions; interface heterogeneity

Domaines: Analyse numérique [math.NA]

Nicole Spillane, Victorita Dolean, Patrice Hauret, Frédéric Nataf, Daniel Rixen. Solving generalized eigenvalue problems on the interfaces to build a robust two level FETI method. 2012. ⟨hal-00756840⟩