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arXiv 1806.04816math.NAcs.NA
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一种用于抛物方程的约束能量最小化广义多尺度有限元方法

A Constraint energy minimizing generalized multiscale finite element method for parabolic equations

Hunan University(湖南大学);The Chinese University of Hong Kong(香港中文大学);Tongji University(同济大学)

Mengnan Li, Eric Chung, Lijian Jiang

AI总结:

本文提出了一种用于多尺度系数抛物方程的约束能量最小化广义多尺度有限元方法(CEM-GMsFEM),分析了其收敛性,证明了在能量范数下具有一级收敛性,在L²范数下具有二级收敛性。

摘要:

本文提出了一种用于多尺度系数抛物方程的约束能量最小化广义多尺度有限元方法(CEM-GMsFEM)。我们给出了该方法的构造,并对其收敛性进行了严谨分析。收敛率由粗网格尺寸和局部谱问题的特征值衰减决定,但与介质的尺度长度和对比度无关。分析表明,在适当假设下,该方法在能量范数下具有关于粗网格尺寸的一级收敛性,在L²范数下具有关于粗网格尺寸的二级收敛性。对于时间离散化,采用有限差分技术,并给出了全离散方案的收敛性分析。此外,推导并分析了后验误差估计器。为多孔介质应用展示了几个数值结果,以确认理论发现并展示该方法的性能。

英文摘要:

In this paper, we present a Constraint Energy Minimizing Generalized Multiscale Finite Element Method (CEM-GMsFEM) for parabolic equations with multiscale coefficients, arising from applications in porous media. We will present the construction of CEM-GMsFEM and rigorously analyze its convergence for the parabolic equations. The convergence rate is characterized by the coarse grid size and the eigenvalue decay of local spectral problems, but is independent of the scale length and contrast of the media. The analysis shows that the method has a first order convergence rate with respect to coarse grid size in the energy norm and second order convergence rate with respect to coarse grid size in $L^2$ norm under some appropriate assumptions. For the temporal discretization, finite difference techniques are used and the convergence analysis of full discrete scheme is given. Moreover, a posteriori error estimator is derived and analyzed. A few numerical results for porous media applications are presented to confirm the theoretical findings and demonstrate the performance of the approach.

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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