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arXiv 1808.09810math.NAcs.NA
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Crouzeix-Raviart元和Morley元的最优超收敛分析

Optimal Superconvergence Analysis for the Crouzeix-Raviart and the Morley elements

Jun Hu, Limin Ma, Rui Ma

摘要:

本文对Crouzeix-Raviart元和Morley元给出了一种改进的超收敛分析。分析的主要思想是分别对一阶混合Raviart-Thomas元和混合Hellan-Herrmann-Johnson元的正则插值和有限元解之间的差进行离散Helmholtz分解。这,特别是允许证明这两个混合有限元的一个完整的一阶超收敛结果。最后,利用Crouzeix-Raviart元和Morley元分别与一阶混合Raviart-Thomas元和混合Hellan-Herrmann-Johnson元的特殊关系,得到了Crouzeix-Raviart元和Morley元的一阶完全超收敛结果.这些超收敛结果也被推广到轻度结构网格。

英文摘要:

In this paper, an improved superconvergence analysis is presented for both the Crouzeix-Raviart element and the Morley element. The main idea of the analysis is to employ a discrete Helmholtz decomposition of the difference between the canonical interpolation and the finite element solution for the first order mixed Raviart--Thomas element and the mixed Hellan--Herrmann--Johnson element, respectively. This, in particular, allows for proving a full one order superconvergence result for these two mixed finite elements. Finally, a full one order superconvergence result of both the Crouzeix-Raviart element and the Morley element follows from their special relations with the first order mixed Raviart--Thomas element and the mixed Hellan--Herrmann--Johnson element respectively. Those superconvergence results are also extended to mildly-structured meshes.

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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