arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.08178math.NAcs.NA
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三维双调和方程的$H^2$ -正四面体有限元

3D $H^2$-nonconforming tetrahedral finite elements for the biharmonic equation

Jun Hu, Shudan Tian, Shangyou Zhang

摘要:

本文构造了一族四面体网格上的$H^2$ -Ⅱ有限元,用于求解三维双调和方程。在该族中,$P_\ell$多项式空间被所有$\ell\ge 3$的高阶多项式所丰富,相应的有限元解在$H^2$范数下收敛于最优阶$\ell-1$.此外,通过分别使用$P_6$和$P_7$多项式来丰富$P_4$和$P_5$多项式空间,对两种低阶情形的结果进行了改进.证明了最优阶误差估计。数值结果证实了理论研究结果。

英文摘要:

In this article, a family of $H^2$-nonconforming finite elements on tetrahedral grids is constructed for solving the biharmonic equation in 3D. In the family, the $P_\ell$ polynomial space is enriched by some high order polynomials for all $\ell\ge 3$ and the corresponding finite element solution converges at the optimal order $\ell-1$ in $H^2$ norm. Moreover, the result is improved for two low order cases by using $P_6$ and $P_7$ polynomials to enrich $P_4$ and $P_5$ polynomial spaces, respectively. The optimal order error estimate is proved. The numerical results are provided to confirm the theoretical findings.

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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