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arXiv 2409.06134math.NAcs.NA
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任意维数任意阶椭圆方程的标准非协调有限元空间构造

A construction of canonical nonconforming finite element spaces for elliptic equations of any order in any dimension

Jia Li, Shuonan Wu

AI总结:

本文提出任意维数、任意阶 H^m 非协调有限元的统一构造,证明其唯一可解性,并通过二维三阶和四阶椭圆问题的数值结果验证理论。

摘要:

本文针对任意 m,n≥1 的 n 维单纯形,提出了标准 H^m 非协调有限元的统一构造。当 m≤n 时,该构造与 Morley-Wang-Xu 元(Math. Comp. 82 (2013), pp. 25–43)保持一致。在一般情形下,自由度和形函数空间呈现出匹配良好的多层结构,可确保二者相互对齐。基于非协调泡函数的概念,本文利用形函数空间的等价积分型表示并对 m 应用归纳法,建立了单元的唯一可解性。相应的非协调有限元方法适用于 2m 阶椭圆问题;二维中 m=3 和 m=4 的数值结果支持了理论分析。

英文摘要:

A unified construction of canonical $H^m$-nonconforming finite elements is developed for $n$-dimensional simplices for any $m, n \geq 1$. Consistency with the Morley-Wang-Xu elements [Math. Comp. 82 (2013), pp. 25-43] is maintained when $m \leq n$. In the general case, the degrees of freedom and the shape function space exhibit well-matched multi-layer structures that ensure their alignment. Building on the concept of the nonconforming bubble function, the unisolvence is established using an equivalent integral-type representation of the shape function space and by applying induction on $m$. The corresponding nonconforming finite element method applies to $2m$-th order elliptic problems, with numerical results for $m=3$ and $m=4$ in 2D supporting the theoretical analysis.

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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