Superconvergence of the Crouzeix-Raviart element for elliptic equation

Superconvergence of the Crouzeix-Raviart element for elliptic equation
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椭圆方程Crouzeix-Raviart元的超收敛性

DOI:
10.1007/s10444-019-09714-9
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发表时间:
2019-07
影响因子:
1.7
通讯作者:
易年余
易年余
中科院分区:
数学4区
文献类型:
--
作者:
Yidan Zhang;Yunqing Huang;易年余

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本文对均匀三角形网格上任意两个相邻三角形构成平行四边形的二阶椭圆方程,导出了Crouzeix-Raviart元法的一个超收敛结果。提出了一种数值应力的局部加权平均后处理算法。基于Crouzeix-Raviart单元法与最低阶Raviart-Thomas单元法的等价性,证明了精确应力与后处理数值应力之间的误差为3/2阶。给出了两个数值算例来验证理论结果。
In this paper, a superconvergence result of the Crouzeix-Raviart element method is derived for the second-order elliptic equation on the uniform triangular meshes, in which any two adjacent triangles form a parallelogram. A local weighted averaging post-processing algorithm for the numerical stress is presented. Based on the equivalence between the Crouzeix-Raviart element method and the lowest order Raviart-Thomas element method, we prove that the error between the exact stress and the postprocessed numerical stress is of orderh3/2. Two numerical examples are presented to confirm the theoretical result.
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