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arXiv 1507.06394math.NAcs.NA
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多尺度抛物问题的渐近保持数值方案

Asymptotic Preserving numerical schemes for multiscale parabolic problems

INRIA(法国国家信息与自动化研究所);Université de Rennes 1(雷恩第一大学);CNRS(法国国家科学研究中心);Université de Genève(日内瓦大学)

Nicolas Crouseilles, Mohammed Lemou, Gilles Vilmart

AI总结:

本文提出一种渐近保持方法,通过精确的微宏观分解,使方案在高振荡和非振荡极限下均保持一致性。

摘要:

我们考虑了一类具有空间上可能小尺度$\varepsilon$振荡扩散系数的多尺度抛物问题。数值均质化方法因能有效捕捉$\varepsilon\rightarrow 0$时的渐近行为而受欢迎,无需在快速振荡尺度上使用剧烈精细的空间离散化。然而,已知的此类均质化方案通常在$\varepsilon\rightarrow 0$的高振荡极限和$\varepsilon\sim 1$的非振荡极限下均不准确。在本文中,我们引入了一种基于解的精确微宏观分解的渐近保持方法,该方法在两种极限下均保持一致性。

英文摘要:

We consider a class of multiscale parabolic problems with diffusion coefficients oscillating in space at a possibly small scale $\varepsilon$. Numerical homogenization methods are popular for such problems, because they capture efficiently the asymptotic behaviour as $\varepsilon \rightarrow 0$, without using a dramatically fine spatial discretization at the scale of the fast oscillations. However, known such homogenization schemes are in general not accurate for both the highly oscillatory regime $\varepsilon \rightarrow 0$ and the non oscillatory regime $\varepsilon \sim 1$. In this paper, we introduce an Asymptotic Preserving method based on an exact micro-macro decomposition of the solution which remains consistent for both regimes.

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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