Abstract
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.
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Acknowledgement
This work was supported by the European Regional Development Fund in the IT4Innovations Centre of Excellence project (identification number CZ.1.05/1.1.00/02.0070). The comments by referees are greatly acknowledged.
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Axelsson, O., Blaheta, R., Hasal, M. (2016). A Comparison of Preconditioning Methods for Saddle Point Problems with an Application to Porous Media Flow Problems. In: Kozubek, T., Blaheta, R., Å Ãstek, J., RozložnÃk, M., ÄŒermák, M. (eds) High Performance Computing in Science and Engineering. HPCSE 2015. Lecture Notes in Computer Science(), vol 9611. Springer, Cham. https://doi.org/10.1007/978-3-319-40361-8_5
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DOI: https://doi.org/10.1007/978-3-319-40361-8_5
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