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BDDC and FETI-DP preconditioners for spectral element discretizations

机译:BDDC和FETI-DP预处理器用于频谱元素离散化

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摘要

Two of the most recent and important nonoverlapping domain decomposition methods, the BDDC method (Balancing Domain Decomposition by Constraints) and the FETI-DP method (Dual-Primal Finite Element Tearing and Interconnecting) are here extended to spectral element discretizations of second-order elliptic problems. In spite of the more severe ill-conditioning of the spectral element discrete systems, compared with low-order finite elements and finite differences, these methods retain their good properties of scalability, quasi-optimality and independence on the discontinuities of the elliptic operator coefficients across subdomain interfaces.
机译:BDDC方法(通过约束进行平衡域分解)和FETI-DP方法(双主有限元撕裂和互连)是两种最新且重要的非重叠域分解方法,在此扩展为二阶椭圆的谱元素离散化问题。尽管频谱元素离散系统的病态更为严重,但与低阶有限元和有限差分相比,这些方法仍具有良好的可伸缩性,拟最优性以及椭圆算子系数不连续性的独立性。子域接口。

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