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arXiv 1201.3564math.NAcs.NA
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各向异性扩散-对流-反应问题的线性有限元近似中的最大值原理

Maximum principle in linear finite element approximations of anisotropic diffusion-convection-reaction problems

Nanjing University of Information Science and Technology(南京信息工程大学);the University of Kansas(堪萨斯大学);Xiamen University(厦门大学)

Changna Lu, Weizhang Huang, Jianxian Qiu

AI总结:

针对各向异性扩散-对流-反应问题的线性有限元近似,提出一种网格条件以保证离散最大值原理,该条件要求网格为单纯形且在扩散矩阵逆指定的度量下满足特定非钝角条件,二维情形可弱化为广义Delaunay条件的摄动。

摘要:

针对各向异性扩散-对流-反应问题的线性有限元近似,开发了一种网格条件以满足离散最大值原理。粗略地说,该条件要求网格是单纯形的,并且在以扩散矩阵的逆指定的度量下测量二面角时,网格是$\mathcal{O}(\|\V{b}\|_\infty h + \|c\|_\infty h^2)$-非钝角的,其中$h$表示网格尺寸,$\V{b}$和$c$是对流项和反应项的系数。在二维情况下,该条件可以替换为更弱的网格条件(广义Delaunay条件的$\mathcal{O}(\|\V{b}\|_\infty h + \|c\|_\infty h^2)$摄动)。这些结果包含了许多现有的网格条件作为特例。给出了数值结果以验证理论发现。

英文摘要:

A mesh condition is developed for linear finite element approximations of anisotropic diffusion-convection-reaction problems to satisfy a discrete maximum principle. Loosely speaking, the condition requires that the mesh be simplicial and $\mathcal{O}(\|\V{b}\|_\infty h + \|c\|_\infty h^2)$-nonobtuse when the dihedral angles are measured in the metric specified by the inverse of the diffusion matrix, where $h$ denotes the mesh size and $\V{b}$ and $c$ are the coefficients of the convection and reaction terms. In two dimensions, the condition can be replaced by a weaker mesh condition (an $\mathcal{O}(\|\V{b}\|_\infty h + \|c\|_\infty h^2)$ perturbation of a generalized Delaunay condition). These results include many existing mesh conditions as special cases. Numerical results are presented to verify the theoretical findings.

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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