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arXiv 1507.01752math.NAcs.NA
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任意阶数的线弹性问题的内罚混合有限元方法(任意维度)

Interior Penalty Mixed Finite Element Methods of Any Order in Any Dimension for Linear Elasticity with Strongly Symmetric Stress Tensor

The Pennsylvania State University(宾夕法尼亚州立大学);Peking University(北京大学)

Shuonan Wu, Shihua Gong, Jinchao Xu

AI总结:

本文提出任意阶数的混合有限元方法,用于线弹性问题,通过引入非 conforming 面气泡空间,建立稳定性,并通过内罚项证明位移和应力的最优误差估计,适用于任意维数的任意单纯形网格。

摘要:

我们提出两类任意阶数的线弹性混合有限元方法,采用内罚法进行非 conforming 对称应力近似。我们的方法关键在于引入适当的非 conforming 面气泡空间,基于离散对称张量的局部分解,从而容易建立稳定性。我们通过添加内罚项证明位移和应力的最优误差估计。由于其基函数的显式表达式,这些元素易于实现。此外,这些方法可以以统一的方式应用于任意维数的任意单纯形网格。提供了2D和3D的数值测试以验证我们的理论结果。

英文摘要:

We propose two classes of mixed finite elements for linear elasticity of any order, with interior penalty for nonconforming symmetric stress approximation. One key point of our method is to introduce some appropriate nonconforming face-bubble spaces based on the local decomposition of discrete symmetric tensors, with which the stability can be easily established. We prove the optimal error estimate for both displacement and stress by adding an interior penalty term. The elements are easy to be implemented thanks to the explicit formulations of its basis functions. Moreover, the methods can be applied to arbitrary simplicial grids for any spatial dimension in a unified fashion. Numerical tests for both 2D and 3D are provided to validate our theoretical results.

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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