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arXiv 1802.08873math.NAcs.NA
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关于无过度采样技术下GMsFEMs求解异质椭圆问题收敛速度的分析

On the Convergence Rates of GMsFEMs for Heterogeneous Elliptic Problems without Oversampling Techniques

Imperial College London(帝国理工学院);Hausdorff Center for Mathematics, Universität Bonn(波恩大学豪斯多夫数学中心)

Guanglian Li

AI总结:

本文研究了无过度采样技术下GMsFEMs在高对比异质系数椭圆问题中的收敛速度,分析了局部谱基函数和局部谐波扩展型基函数的最优收敛性,并证明了其在能量范数下的收敛性。

摘要:

本文致力于研究Generalized Multiscale Finite Element Methods (GMsFEMs)在高对比异质系数椭圆问题中的收敛速度分析。GMsFEMs是求解具有异质高对比系数流动问题的流行数值方法,并在广泛的应用中表现出极高的数值结果。然而,该方法的数学有效性仍缺乏充分的理论支持。本文在GMsFEM框架内分析了两种多尺度基函数,即局部谱基函数和局部谐波扩展型基函数。这些构造在近几年内已被应用于许多领域。我们在此条件下建立了其在能量范数下的最优收敛性,假设源项属于某种加权$L^2$空间,并且不借助任何过度采样技术。此外,我们分析了局部谐波扩展基函数的模型降阶并证明了其在能量范数下的收敛性。这些理论发现为GMsFEMs的效率机制提供了新的见解。

英文摘要:

This work is concerned with the rigorous analysis on the Generalized Multiscale Finite Element Methods (GMsFEMs) for elliptic problems with high-contrast heterogeneous coefficients. GMsFEMs are popular numerical methods for solving flow problems with heterogeneous high-contrast coefficients, and it has demonstrated extremely promising numerical results for a wide range of applications. However, the mathematical justification of the efficiency of the method is still largely missing. In this work, we analyze two types of multiscale basis functions, i.e., local spectral basis functions and basis functions of local harmonic extension type, within the GMsFEM framework. These constructions have found many applications in the past few years. We establish their optimal convergence in the energy norm under a very mild assumption that the source term belongs to some weighted $L^2$ space, and without the help of any oversampling technique. Furthermore, we analyze the model order reduction of the local harmonic extension basis and prove its convergence in the energy norm. These theoretical findings shed insights into the mechanism behind the efficiency of the GMsFEMs.

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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