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arXiv 1707.00764math.NAcs.NA
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一种用于椭圆问题的Nitsche有限元方法

A Nitsche Finite Element Approach for Elliptic Problems with Discontinuous Dirichlet Boundary Conditions

Mathematics Institute, University of Bern(伯尔尼大学数学研究所)

Ramona Baumann, Thomas P. Wihler

AI总结:

本文提出一种数值近似方法,用于处理具有不连续Dirichlet边界条件的线性扩散-反应问题,通过Nitsche有限元方法实现二阶收敛性。

摘要:

我们提出了一种数值近似方法,用于线性扩散-反应问题,其中可能具有不连续的Dirichlet边界条件。此类问题的解可以表示为已知奇异性函数的线性组合以及一个H²正则部分。后者部分以一个具有正则化Dirichlet边界条件的椭圆问题形式表达,并可通过Nitsche有限元方法近似。原问题的离散解则通过将精确解的奇异性部分加到Nitsche近似中来定义。由此,离散解相对于网格尺寸表现出二阶收敛性。

英文摘要:

We present a numerical approximation method for linear diffusion-reaction problems with possibly discontinuous Dirichlet boundary conditions. The solution of such problems can be represented as a linear combination of explicitly known singular functions as well as of an $H^2$-regular part. The latter part is expressed in terms of an elliptic problem with regularized Dirichlet boundary conditions, and can be approximated by means of a Nitsche finite element approach. The discrete solution of the original problem is then defined by adding the singular part of the exact solution to the Nitsche approximation. In this way, the discrete solution can be shown to converge of second order with respect to the mesh size.

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