An approximate BDDC preconditioner
An approximate BDDC preconditioner
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近似 BDDC 预处理器
DOI:
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发表时间:
2007
影响因子:
4.3
通讯作者:
C. Dohrmann
中科院分区:
文献类型:
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作者:
C. Dohrmann
The balancing domain decomposition by constraints (BDDC) preconditioner requires direct solutions of two linear systems for each substructure and one linear system for a global coarse problem. The computations and memory needed for these solutions can be prohibitive if any one system is too large. We investigate an approach for addressing this issue based on approximating the direct solutions using preconditioners. In order to retain the attractive numerical properties of the exact version of BDDC, some of the preconditioners must possess a property related to the substructure null spaces. We describe a simple method to equip preconditioners with this property. Numerical results demonstrate the usefulness of the approach and confirm the theory. Published in 2006 by John Wiley & Sons, Ltd.