Název:
A Comparison of Preconditioning Methods for Saddle Point Problems with an Application to Porous Media Flow Problems
Autoři:
Axelsson, Owe ; Blaheta, Radim ; Hasal, Martin Typ dokumentu: Příspěvky z konference Konference/Akce: International Conference on High Performance Computing in Science and Engineering (HPCSE) /2./, Soláň (CZ), 20150525
Rok:
2016
Jazyk:
eng
Abstrakt: The paper overviews and compares some block preconditioners for the solution of saddle point systems, especially systems arising from the Brinkman model of porous media flow. The considered preconditioners involve different Schur complements as inverse free Schur complement in HSS (Hermitian - Skew Hermitian Splitting preconditioner), Schur complement to the velocity matrix and finally Schur complement to a regularization block in the augmented matrix preconditioner. The inverses appearing in most of the considered Schur complements are approximated by simple sparse approximation techniques as element-by-element and Frobenius norm minimization approaches. A special interest is devoted to problems involving various Darcy, Stokes and Brinkman flow regions, the efficiency of preconditioners in this case is demonstrated by some numerical experiments.
Klíčová slova:
high performance computing; linear-systems; schur complements Číslo projektu: ED1.1.00/02.0070 Poskytovatel projektu: GA MŠk Zdrojový dokument: High performance computing in science and engineering - HPCSE 2015, ISBN 978-3-319-40361-8; 978-3-319-40360-1, ISSN 0302-9743 Poznámka: Související webová stránka: http://link.springer.com/chapter/10.1007%2F978-3-319-40361-8_5
Instituce: Ústav geoniky AV ČR
(web)
Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0266018