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arXiv 2102.02700math.NAcs.NA
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高非均匀系数椭圆Mortar有限元问题的加法平均Schwarz方法

Additive Average Schwarz Method for Elliptic Mortar Finite Element Problems with Highly Heterogeneous Coefficients

Ali Khademi, Leszek Marcinkowski, Sanjib Kumar Acharya, Talal Rahman

摘要:

本文将加法平均Schwarz方法推广到求解二阶椭圆型边值问题,利用Mortar技术,在非匹配网格上用Mortar有限元离散,在子域内和界面上均具有非均匀系数.在这种两级方法中,我们以两种不同的方式丰富粗空间,即,通过将广义本征值问题的两个变式的本征函数相加。我们证明了由推广的加性平均Schwarz方法得到的代数方程组对应于两个粗空间的条件数为O(H/h)阶且与系数的跳跃无关,其中H和h是网格参数.

英文摘要:

In this paper, we extend the additive average Schwarz method to solve second order elliptic boundary value problems with heterogeneous coefficients inside the subdomains and across their interfaces by the mortar technique, where the mortar finite element discretization is on nonmatching meshes. In this two-level method, we enrich the coarse space in two different ways, i.e., by adding eigenfunctions of two variants of the generalized eigenvalue problems. We prove that the condition numbers of the systems of algebraic equations resulting from the extended additive average Schwarz method, corresponding to both coarse spaces, are of the order O(H/h) and independent of jumps in the coefficients, where H and h are the mesh parameters.

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