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arXiv 1602.01512math.NAcs.NA
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全梯度稳定切割有限元方法用于表面偏微分方程

Full Gradient Stabilized Cut Finite Element Methods for Surface Partial Differential Equations

University College London(伦敦大学学院);Jönköping University(延雪平大学);Umeå University(于默奥大学);KTH(皇家理工学院)

Erik Burman, Peter Hansbo, Mats G. Larson, André Massing, Sara Zahedi

AI总结:

本文提出并分析了一种新的稳定切割有限元方法,用于闭合曲面上的拉普拉斯-贝尔特里算子。新稳定项控制主动网格中交界面元素的全梯度,相比面稳定项更易实现且不显著增加质量矩阵和刚度矩阵的非零元素数量。

摘要:

我们提出并分析了一种新的稳定切割有限元方法,用于闭合曲面上的拉普拉斯-贝尔特里算子。新的稳定项控制主动网格中交界面元素的全梯度。与基于控制主动网格中元素间面法向梯度跃变的面稳定项相比,全梯度稳定项更易实现且不显著增加质量矩阵和刚度矩阵的非零元素数量。全梯度稳定项可与基于切向或全梯度的拉普拉斯-贝尔特里算子变分公式结合,我们提出一种简单统一的分析,涵盖两种情况。全梯度稳定项导致一致性误差,但对线性分片元素来说具有最优阶数,我们获得了能量范数和L2范数下的最优阶数先验误差估计,以及最优的条件数界。最后,我们给出了详细的数值实验,特别研究了条件数和误差对稳定参数的敏感性。

英文摘要:

We propose and analyze a new stabilized cut finite element method for the Laplace-Beltrami operator on a closed surface. The new stabilization term provides control of the full $\mathbb{R}^3$ gradient on the active mesh consisting of the elements that intersect the surface. Compared to face stabilization, based on controlling the jumps in the normal gradient across faces between elements in the active mesh, the full gradient stabilization is easier to implement and does not significantly increase the number of nonzero elements in the mass and stiffness matrices. The full gradient stabilization term may be combined with a variational formulation of the Laplace-Beltrami operator based on tangential or full gradients and we present a simple and unified analysis that covers both cases. The full gradient stabilization term gives rise to a consistency error which, however, is of optimal order for piecewise linear elements, and we obtain optimal order a priori error estimates in the energy and $L^2$ norms as well as an optimal bound of the condition number. Finally, we present detailed numerical examples where we in particular study the sensitivity of the condition number and error on the stabilization parameter.

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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