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arXiv 1409.7744math.NAcs.NA
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有限元近似对R^n中简单形网格上的对称张量:高阶情况

Finite element approximations of symmetric tensors on simplicial grids in Rn: the high order case

LMAM, School of Mathematical Sciences, and Beijing International Center for Mathematical Research, Peking University(北京大学数学科学学院,北京大学国际数学研究中心)

Jun Hu

AI总结:

本文提出了一种在任意维度上构建对称应力近似的混合有限元方法,扩展了二维和三维中的方法,适用于任意简单形剖分。

摘要:

在弹性力学中,混合有限元方法设计具有对称应力近似一直是个难题,直到Arnold和Winther设计了首个混合有限元家族,其中离散应力空间是H(div,Ω;S)中的P_{k+1}张量,其散度是每个三角形上的P_{k-1}多项式。本文在任意简单形中构造了统一的混合有限元方法,其中离散应力空间是H(div,Ω;S)中的P_k张量,而离散位移空间是L^2(Ω;R^n)中的P_{k-1}向量,适用于任意空间维度。

英文摘要:

The design of mixed finite element methods in linear elasticity with symmetric stress approximations has been a longstanding open problem until Arnold and Winther designed the first family of mixed finite elements where the discrete stress space is the space of $H(\d,Ω; \mathbb {S})$---$P_{k+1}$ tensors whose divergence is a $P_{k-1}$ polynomial on each triangle for $k\geq 2$.Such a two dimensional family was extended, by Arnold, Awanou and Winther, to a three dimensional family of mixed elements where the discrete stress space is the space of $H(\d,Ω; \mathbb {S})$---$P_{k+2}$ tensors, whose divergence is a $P_{k-1}$ polynomial on each tetrahedron for $k\geq 2$. In this paper, we are able to construct, in a unified fashion, mixed finite element methods with symmetric stress approximations on an arbitrary simplex in $\mathbb{R}^n$ for any space dimension. On the contrary, the discrete stress space here is the space of $H(\d,Ω;\mathbb {S})$---$P_k$ tensors, and the discrete displacement space here is the space of $L^2(Ω; \mathbb{R}^n)$---$P_{k-1}$ vectors for $k\geq n+1$. These finite element spaces are defined with respect to an arbitrary simplicial triangulation of the domain, and can be regarded as extensions to any dimension of those in two and three dimensions by Hu and Zhang.

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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