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arXiv 2005.09546math.NAcs.NA
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不连续Galerkin等几何分析的IETI-DP解算器的收敛性理论

Convergence theory for IETI-DP solvers for discontinuous Galerkin Isogeometric Analysis that is explicit in h and p

Rainer Schneckenleitner, Stefan Takacs

摘要:

在本文中,我们开发了一个收敛理论的双原始等几何撕裂和互连(IETI-DP)求解器等几何多补丁离散的泊松问题,其中补丁耦合使用不连续的伽辽金。所提出的理论提供了条件数的界限,是明确的网格大小h和样条度p。我们给出了一个分析,认为各种选择的原始自由度:顶点值,边缘平均值,和两者的组合。如果仅取顶点值或顶点值和边平均值作为原始自由度,则条件数界与相容情形相同。如果只取边缘平均值,收敛理论和实验都表明,预处理系统的条件数随相邻块上网格尺寸的比值而增长。

英文摘要:

In this paper, we develop a convergence theory for Dual-Primal Isogeometric Tearing and Interconnecting (IETI-DP) solvers for isogeometric multi-patch discretizations of the Poisson problem, where the patches are coupled using discontinuous Galerkin. The presented theory provides condition number bounds that are explicit in the grid sizes h and in the spline degrees p. We give an analysis that holds for various choices for the primal degrees of freedom: vertex values, edge averages, and a combination of both. If only the vertex values or both vertex values and edge averages are taken as primal degrees of freedom, the condition number bound is the same as for the conforming case. If only the edge averages are taken, both the convergence theory and the experiments show that the condition number of the preconditioned system grows with the ratio of the grid sizes on neighboring patches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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