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arXiv 2310.00519math.NAcs.NA
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基于延拓方法的弯曲区域中广义 Robin 边值问题的有限元分析

Finite element analysis of a generalized Robin boundary value problem in curved domains based on the extension method

Takahito Kashiwabara

AI总结:

针对弯曲光滑区域上边界含二阶算子的广义 Robin 边值问题,提出基于延拓方法的等参有限元格式,证明 $H^1$ 与 $L^2$ 范数最优收敛阶并给出线性元算例。

摘要:

本文针对一个广义 Robin 边值问题给出了有限元方法的理论分析,该问题在边界上涉及一个二阶微分算子。若 $Ω$ 是具有弯曲边界的一般光滑区域,则需要引入近似区域 $Ω_h$,并处理由区域扰动 $Ω\ eq Ω_h$ 引起的问题。与现有研究采用的变换方法不同,作者采用在实际计算中更易于处理的延拓方法来构造数值格式。在近似区域和函数空间由 $k$ 阶等参有限元给出的假设下,证明了在 $H^1$ 范数和 $L^2$ 范数下的最优收敛阶。文中还针对 $k=1$ 的分段线性情形给出了一个数值算例。

英文摘要:

A theoretical analysis of the finite element method for a generalized Robin boundary value problem, which involves a second-order differential operator on the boundary, is presented. If $Ω$ is a general smooth domain with a curved boundary, we need to introduce an approximate domain $Ω_h$ and to address issues owing to the domain perturbation $Ω\neq Ω_h$. In contrast to the transformation approach used in existing studies, we employ the extension approach, which is easier to handle in practical computation, in order to construct a numerical scheme. Assuming that approximate domains and function spaces are given by isoparametric finite elements of order $k$, we prove the optimal rate of convergence in the $H^1$- and $L^2$-norms. A numerical example is given for the piecewise linear case $k = 1$.

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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