A stabilized linearity-preserving scheme for the heterogeneous and anisotropic diffusion problems on polygonal meshes

A stabilized linearity-preserving scheme for the heterogeneous and anisotropic diffusion problems on polygonal meshes
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多边形网格上异质和各向异性扩散问题的稳定线性保持方案

DOI:
10.1016/j.jcp.2012.06.042
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发表时间:
2012-08
影响因子:
4.1
通讯作者:
Dai, Zihuan
Dai, Zihuan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wu, Jiming;Gao, Zhiming;Dai, Zihuan

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本文提出了一种在一般多边形网格上求解非均匀各向异性扩散问题的稳定离散格式。未知量是单元中心的值,该方案依赖于线性保持准则和使用位于异质界面的所谓谐波平均点。在多边形网格上,在相当一般和标准的假设下,得到了H1模下的稳定性结果和误差估计。在多个不同网格上的实验结果表明,该格式在L2和H1范数下均保持最优收敛速度。
In this paper a stabilized discretization scheme for the heterogeneous and anisotropic diffusion problems is proposed on general, possibly nonconforming polygonal meshes. The unknowns are the values at the cell center and the scheme relies on linearity-preserving criterion and the use of the so-called harmonic averaging points located at the interface of heterogeneity. The stability result and error estimate both in H1norm are obtained under quite general and standard assumptions on polygonal meshes. The experiment results on a number of different meshes show that the scheme maintains optimal convergence rates in both L2and H1norms.
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扭曲网格上扩散方程的具有显式权重的九点方案
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