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Two block triangular preconditioners for asymmetric saddle point problems
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DOI：10.1016/j.amc.2015.07.093.png)
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Abstract
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In this paper, two block triangular preconditioners for the asymmetric saddle point problems with singular (1,1) block are presented. The spectral characteristics of the preconditioned matrices are discussed in detail. Theoretical analysis shows that all the eigenvalues of the preconditioned matrices are strongly clustered. Numerical experiments are reported to the efficiency of the proposed preconditioners. (C) 2015 Elsevier Inc. All rights reserved.
Keywords:
Block triangular preconditioner
Saddle point problems
Nullity
Augmentation
Krylov subspace method
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