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arXiv 1710.03343math.NAcs.NA
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高阶切割有限元方法在曲面上的稳定性

Stabilization of High Order Cut Finite Element Methods on Surfaces

Umeå University(于默奥大学);KTH Royal Institute of Technology(皇家理工学院)

Mats G. Larson, Sara Zahedi

AI总结:

本文提出并分析了一种稳定化项,用于曲面嵌入R^d中的椭圆二阶偏微分方程的切割有限元近似,通过正常导数的适当缩放和跨面导数跳跃的控制,实现了有限元解在活性三维元素上的变化控制,并展示了刚度矩阵的条件数为O(h^{-2})。

摘要:

我们开发并分析了一种稳定化项,用于切割有限元近似嵌入R^d中的曲面上的椭圆二阶偏微分方程。新的稳定化项结合了曲面处适当缩放的法向导数以及跨面法向导数跳跃的控制,从而控制了活性三维元素上有限元解的变化。我们证明刚度矩阵的条件数为O(h^{-2}),其中h是网格参数。该稳定化项适用于线性及更高阶元素,其推导过程较为直接,我们通过讨论将其扩展到一般嵌入R^d中的n维光滑流形,其余维数为d-n。我们还提出了一个一般稳定化项的性质,这些性质足以证明条件数的最佳缩放和能量及L^2范数的最佳误差估计。最后,我们通过数值研究验证了我们的理论结果。

英文摘要:

We develop and analyze a stabilization term for cut finite element approximations of an elliptic second order partial differential equation on a surface embedded in $\mathbb{R}^d$. The new stabilization term combines properly scaled normal derivatives at the surface together with control of the jump in the normal derivatives across faces and provides control of the variation of the finite element solution on the active three dimensional elements that intersect the surface. We show that the condition number of the stiffness matrix is $O(h^{-2})$, where $h$ is the mesh parameter. The stabilization term works for linear as well as for higher-order elements and the derivation of its stabilizing properties is quite straightforward, which we illustrate by discussing the extension of the analysis to general $n$-dimensional smooth manifolds embedded in $\mathbb{R}^d$, with codimension $d-n$. We also formulate properties of a general stabilization term that are sufficient to prove optimal scaling of the condition number and optimal error estimates in energy- and $L^2$-norm. We finally present numerical studies confirming 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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