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arXiv 2008.01617math.NAcs.NA
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一般四阶变系数问题的鲁棒双虚元法

Robust nonconforming virtual element methods for general fourth order problems with varying coefficients

Andreas Dedner, Alice Hodson

摘要:

对二维一般四阶偏微分方程提出了一类双虚元方法。我们开发了一个通用的方法来构建必要的投影算子和虚拟元素空间。对于一般的变系数线性四阶问题,给出了能量范数下的最优误差估计。我们还讨论了四阶摄动问题,并提出了一种新的非线性格式,它是一致收敛的扰动参数,而不需要扩大的空间。数值试验验证了理论结果。最后,我们简要讨论我们的方法可以很容易地应用到非线性四阶问题。

英文摘要:

We present a class of nonconforming virtual element methods for general fourth order partial differential equations in two dimensions. We develop a generic approach for constructing the necessary projection operators and virtual element spaces. Optimal error estimates in the energy norm are provided for general linear fourth order problems with varying coefficients. We also discuss fourth order perturbation problems and present a novel nonconforming scheme which is uniformly convergent with respect to the perturbation parameter without requiring an enlargement of the space. Numerical tests are carried out to verify the theoretical results. We conclude with a brief discussion on how our approach can easily be applied to nonlinear fourth order problems.

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