TY - GEN
T1 - Robust solvers for symmetric positive definite operators and weighted Poincaré inequalities
AU - Efendiev, Yalchin
AU - Galvis, Juan
AU - Lazarov, Raytcho
AU - Willems, Joerg
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-016-04
Acknowledgements: The research of Y. Efendiev was partially supported bythe DOE and NSF (DMS 0934837, DMS 0724704, and DMS 0811180). The re-search of Y. Efendiev, J. Galvis, and R. Lazarov was supported in parts by awardKUS-C1-016-04, made by King Abdullah University of Science and Technology(KAUST). The research of R. Lazarov and J. Willems was supported in partsby NSF Grant DMS-1016525.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2012
Y1 - 2012
N2 - An abstract setting for robustly preconditioning symmetric positive definite (SPD) operators is presented. The term "robust" refers to the property of the condition numbers of the preconditioned systems being independent of mesh parameters and problem parameters. Important instances of such problem parameters are in particular (highly varying) coefficients. The method belongs to the class of additive Schwarz preconditioners. The paper gives an overview of the results obtained in a recent paper by the authors. It, furthermore, focuses on the importance of weighted Poincaré inequalities, whose notion is extended to general SPD operators, for the analysis of stable decompositions. To demonstrate the applicability of the abstract preconditioner the scalar elliptic equation and the stream function formulation of Brinkman's equations in two spatial dimensions are considered. Several numerical examples are presented.
AB - An abstract setting for robustly preconditioning symmetric positive definite (SPD) operators is presented. The term "robust" refers to the property of the condition numbers of the preconditioned systems being independent of mesh parameters and problem parameters. Important instances of such problem parameters are in particular (highly varying) coefficients. The method belongs to the class of additive Schwarz preconditioners. The paper gives an overview of the results obtained in a recent paper by the authors. It, furthermore, focuses on the importance of weighted Poincaré inequalities, whose notion is extended to general SPD operators, for the analysis of stable decompositions. To demonstrate the applicability of the abstract preconditioner the scalar elliptic equation and the stream function formulation of Brinkman's equations in two spatial dimensions are considered. Several numerical examples are presented.
KW - Brinkman's problem
KW - domain decomposition
KW - generalized weighted Poincaré inequalities
KW - high contrast
KW - robust additive Schwarz preconditioner
KW - spectral coarse spaces
UR - http://www.scopus.com/inward/record.url?scp=84861732957&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-29843-1_4
DO - 10.1007/978-3-642-29843-1_4
M3 - Conference contribution
AN - SCOPUS:84861732957
SN - 9783642298424
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 43
EP - 51
BT - Large-Scale Scientific Computing - 8th International Conference, LSSC 2011, Revised Selected Papers
T2 - 8th International Conference on Large-Scale Scientific Computations,LSSC 2011
Y2 - 6 June 2011 through 10 June 2011
ER -