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arXiv 1711.08751math.NAcs.NA
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代数多重网格方法中的理想插值算子

On the Ideal Interpolation Operator in Algebraic Multigrid Methods

LSEC, Institute of Computational Mathematics and Scientific/Engineering Computing, Academy of Mathematics and Systems Science, Chinese Academy of Sciences(中国科学院数学与系统科学研究院计算数学与科学工程计算研究所);School of Mathematical Sciences, University of Chinese Academy of Sciences(中国科学院大学数学科学学院);NCMIS, Academy of Mathematics and Systems Science, Chinese Academy of Sciences(中国科学院数学与系统科学研究院)

Xuefeng Xu, Chen-Song Zhang

AI总结:

本文研究了代数多重网格方法中理想插值算子的特性,提出新的充分必要条件和等价条件,为设计更高效的多重网格算法提供新思路。

摘要:

在过去几十年中,各种代数多重网格算法已被开发用于科学和工程计算中的问题解决。它们在实践中已被证明适用于在无结构网格上求解离散偏微分方程。代数多重网格算法的一个关键组成部分是构造有效扩展算子的策略。在许多关于构造扩展算子的问题中,一个重要问题是如何评估其质量。在本文中,我们建立了所谓理想插值算子的新特性(包括充分条件、必要条件和等价条件)。我们的结果表明,与常识相比,构造理想插值算子有更多空间,这为设计代数多重网格算法提供了新的见解。此外,我们推导了一类理想插值算子的新表达式。

英文摘要:

Various algebraic multigrid algorithms have been developed for solving problems in scientific and engineering computation over the past decades. They have been shown to be well-suited for solving discretized partial differential equations on unstructured girds in practice. One key ingredient of algebraic multigrid algorithms is a strategy for constructing an effective prolongation operator. Among many questions on constructing a prolongation, an important question is how to evaluate its quality. In this paper, we establish new characterizations (including sufficient condition, necessary condition, and equivalent condition) of the so-called ideal interpolation operator. Our result suggests that, compared with common wisdom, one has more room to construct an ideal interpolation, which can provide new insights for designing algebraic multigrid algorithms. Moreover, we derive a new expression for a class of ideal interpolation operators.

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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