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arXiv 1410.0293math.NAcs.NA
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局部谐波特征基函数用于多尺度有限元方法

Localized Harmonic Characteristic Basis Functions for Multiscale Finite Element Methods

Instituto de Matemática e Estatística, Universidade de São Paulo(圣保罗大学数学与统计研究所);Departamento de Matemáticas, Universidad Nacional de Colombia(哥伦比亚国立大学数学系);Center for Numerical Porous Media, Applied Mathematics. Computational Science and Earth Sciences & Engineering, King Abdullah University of Science and Technology(阿卜杜拉国王科技大学应用数学、计算科学与地球科学与工程中心数值多孔介质研究中心)

Leonardo A. Poveda, Sebastian Huepo, Victor M. Calo, Juan Galvis

AI总结:

本文提出一种多尺度有限元方法,通过局部谐波特征基函数高效求解高各向异性材料中的椭圆方程,数值实验验证了方法的有效性。

摘要:

我们解决在高度各向异性材料上提出的椭圆方程组。这类问题的例子包括复合结构和地质过程。我们专注于一个模型问题,即具有不连续系数的二阶椭圆方程。这些系数代表复合材料的导电性。我们假设一个低导电率的背景,其中包含具有不同热性质的包含物。在这一场景下,我们设计了一种多尺度有限元方法,以高效地近似解。该方法基于解的渐近展开,以导电率的比值为变量。所得到的方法构造(局部)有限元基函数(每个包含物一个)。这些基函数生成多尺度有限元空间,其中解的近似计算是在该空间中进行的。数值实验显示了所提出方法的良好性能。

英文摘要:

We solve elliptic systems of equations posed on highly heterogeneous materials. Examples of this class of problems are composite structures and geological processes. We focus on a model problem which is a second-order elliptic equation with discontinuous coefficients. These coefficients represent the conductivity of a composite material. We assume a background with low conductivity that contains inclusions with different thermal properties. Under this scenario we design a multiscale finite element method to efficiently approximate solutions. The method is based on an asymptotic expansions of the solution in terms of the ratio between the conductivities. The resulting method constructs (locally) finite element basis functions (one for each inclusion). These bases that generate the multiscale finite element space where the approximation of the solution is computed. Numerical experiments show the good performance of the proposed methodology.

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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