Numerical Study of Two Sparse AMG-methods
University of Jyväskylä,
Department of Mathematical Information Technology,
P.O. Box 35 (Agora), 40351 Jyväskylä, Finland. Janne.Martikainen@mit.jyu.fi.
Revised: 9 October 2002
A sparse algebraic multigrid method is studied as a cheap and accurate way to compute approximations of Schur complements of matrices arising from the discretization of some symmetric and positive definite partial differential operators. The construction of such a multigrid is discussed and numerical experiments are used to verify the properties of the method.
Mathematics Subject Classification: 65F10 / 65N22
Key words: Algebraic multigrid / Schur complement / Lagrange multipliers.
© EDP Sciences, SMAI, 2003