A small stencil and extremum-preserving scheme for anisotropic diffusion problems on arbitrary 2D and 3D meshes

A small stencil and extremum-preserving scheme for anisotropic diffusion problems on arbitrary 2D and 3D meshes
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针对任意 2D 和 3D 网格上的各向异性扩散问题的小型模板和极值保持方案

DOI:
10.1016/j.jcp.2013.05.013
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发表时间:
2013-10
影响因子:
4.1
通讯作者:
Wu, Jiming
Wu, Jiming
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gao, Zhiming;Wu, Jiming

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本文在一般的二维和三维网格上,通过一定的保线性度方法,提出了一种非均匀各向异性扩散问题的非线性保极值格式。利用位于非均质界面的调和平均点来定义辅助未知量。这种新格式是局部保守的,只有以单元为中心的未知数,并且有一个小模板,在结构化四边形网格上是五点,在结构化六面体网格上是七点。在相当一般的假设下,得到了在H1范数下的稳定性结果。数值结果表明,该格式具有很好的稳健性和保极值性,并且在扩散张量取为各向异性、有时不连续的情况下,在一般的扭曲网格上验证了最优收敛速度。
In this paper a nonlinear extremum-preserving scheme for the heterogeneous and anisotropic diffusion problems is proposed on general 2D and 3D meshes through a certain linearity-preserving approach. The so-called harmonic averaging points located at the interface of heterogeneity are employed to define the auxiliary unknowns. This new scheme is locally conservative, has only cell-centered unknowns and possesses a small stencil, which is five-point on the structured quadrilateral meshes and seven-point on the structured hexahedral meshes. The stability result in H1norm is obtained under quite general assumptions. Numerical results show that our scheme is robust and extremum-preserving, and the optimal convergence rates are verified on general distorted meshes in case that the diffusion tensor is taken to be anisotropic, at times discontinuous.
DOI: 10.1016/j.jcp.2012.06.042
发表时间: 2012-08
影响因子: 4.1
作者:
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