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arXiv 1401.0977math.NAcs.NA
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富化Crouzeix-Raviart元等同于Raviart-Thomas元

The enriched Crouzeix-Raviart elements are equivalent to the Raviart-Thomas elements

LMAM and School of Mathematical Sciences, Peking University(北京大学数学科学学院)

Jun Hu, Rui Ma

AI总结:

本文证明富化Crouzeix-Raviart元等同于一阶Raviart-Thomas元,二者产生相同离散应力,并在拉普拉斯特征值问题中误差等价。

摘要:

对于泊松模型问题和斯托克斯问题在任意维度中,本文证明富化Crouzeix-Raviart元实际上等同于一阶Raviart-Thomas元,即它们产生相同的离散应力。这一结果改进了文献中二维情况下一阶Raviart-Thomas元和Crouzeix-Raviart元应力分量投影相等的结论。对于拉普拉斯算子的特征值问题,本文证明富化Crouzeix-Raviart元的误差与Raviart-Thomas元的误差在高阶项上等价。

英文摘要:

For both the Poisson model problem and the Stokes problem in any dimension, this paper proves that the enriched Crouzeix-Raviart elements are actually identical to the first order Raviart-Thomas elements in the sense that they produce the same discrete stresses. This result improves the previous result in literature which, for two dimensions, states that the piecewise constant projection of the stress by the first order Raviart-Thomas element is equal to that by the Crouzeix-Raviart element. For the eigenvalue problem of Laplace operator, this paper proves that the error of the enriched Crouzeix-Raviart element is equivalent to that of the Raviart-Thomas element up to higher order terms.

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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