Deflation, Projector Preconditioning, and Balancing in Iterative Substructuring Methods: Connections and New Results

Deflation, Projector Preconditioning, and Balancing in Iterative Substructuring Methods: Connections and New Results
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迭代子结构方法中的紧缩、投影仪预处理和平衡:联系和新结果

DOI:
10.1137/100811118
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发表时间:
2012
期刊:
SIAM J. Sci. Comput.
影响因子:
--
通讯作者:
Rheinbach
Rheinbach
中科院分区:
--
文献类型:
--
作者:
Klawonn;Rheinbach

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在本文中,投影机预处理,也被称为放气方法,以及平衡预处理器施加到双原始有限元撕裂和互连(FETI-DP)和平衡域分解约束(BDDC)的方法,以创建第二个,独立的粗糙问题。这可以帮助扩展经典FETI-DP和BDDC方法的并行可缩放性而不使用不精确求解器,并且还可以用于提高鲁棒性,例如,几乎不可压缩的弹性问题。FETI-DP方法的连接应用一个变换的基础上使用一个更大的粗空间与相应的FETI-DP方法使用投影预处理或平衡指出。然后,它示出的方法具有基本上相同的频谱。可压缩和几乎不可压缩线弹性的数值结果。投影方法的灵敏度的不精确计算的投影数值研究和不同的行为,投影机预处理和平衡预条件被发现。
In this paper, projector preconditioning, also known as the deflation method, as well as the balancing preconditioner are applied to the dual-primal finite element tearing and interconnecting (FETI-DP) and balancing domain decomposition by constraints (BDDC) methods in order to create a second, independent coarse problem. This may help to extend the parallel scalability of classical FETI-DP and BDDC methods without the use of inexact solvers and may also be used to improve the robustness, e.g., for almost incompressible elasticity problems. Connections of FETI-DP methods applying a transformation of basis using a larger coarse space with a corresponding FETI-DP method using projector preconditioning or balancing are pointed out. It is then shown that the methods have essentially the same spectrum. Numerical results for compressible and almost incompressible linear elasticity are provided. The sensitivity of the projection methods to an inexact computation of the projections is numerically investigated and a different behavior for projector preconditioning and the balancing preconditioner is found.
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