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arXiv 1502.04217math.NAcs.NA
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非符合有限元法应用于驱动腔问题

Nonconforming finite element method applied to the driven cavity problem

Seoul National University(首尔大学);Nanyang Technological University(南洋理工大学)

Roktaek Lim, Dongwoo Sheen

AI总结:

本文提出了一种最便宜的稳定非符合有限元法,用于求解无滑动角奇异性的正方形腔体内不可压缩流体流动,通过最少的自由度实现了高精度。

摘要:

本文介绍了一种最便宜的稳定非符合有限元法,用于求解无滑动角奇异性的正方形腔体内不可压缩流体流动。该方法基于矩形网格上的$P_1\times \widetilde{{\mathcal P}_{c}^h}$非符合有限元对,通过最小修改处理顶部边界上的不连续Dirichlet数据。所提出的Stokes元相比已知的稳定Stokes元具有最少的自由度。三种精度指标被分析并数值验证。此外,使用所提元得到的各种计算结果显示出优异的精度。

英文摘要:

A cheapest stable nonconforming finite element method is presented for solving the incompressible flow in a square cavity without smoothing the corner singularities. The stable cheapest nonconforming finite element pair based on $P_1\times \widetilde{{\mathcal P}_{c}^h}$ on rectangular meshes \cite{stab-cheapest} is employed with a minimal modification for the discontinuous Dirichlet data on the top boundary, where $\widetilde{{\mathcal P}_{c}^h}$ is the finite element space of piecewise constant pressures with the globally one-dimensional checker-board pattern subspace eliminated. The proposed Stokes elements have least number of degrees of freedom compared to those of known stable Stokes elements. Three accuracy indications for our elements are analyzed and numerically verified. Also, various numerous computational results obtained by using our proposed element show excellent accuracy.

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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