arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.12399math.NAcs.NA
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三维空间divdiv协调对称张量的有限元

Finite elements for divdiv-conforming symmetric tensors in three dimensions

Long Chen, Xuehai Huang

摘要:

对三维divdiv协调对称张量构造了四面体上的两类有限元空间。构造的关键工具是多项式张量空间的分解和迹算子的刻画。首先,我们给出了divdiv Hilbert复形及其相应的多项式复形。由多项式复形导出了多项式向量空间和多项式张量空间的几种分解。然后,div-div算子的迹通过Green恒等式来刻画。除了法线-法线分量之外,涉及张量的一阶导数的组合的另一个迹线在整个面上是连续的。由于多项式的光滑性,对称张量元素在顶点处和与每条边正交的平面上也是连续的。第三,用同样的方法构造了对称卷曲协调无迹张量的有限元。最后,建立了三维空间的有限元divdiv复形和泡函数复形。

英文摘要:

Two types of finite element spaces on a tetrahedron are constructed for divdiv conforming symmetric tensors in three dimensions. The key tools of the construction are the decomposition of polynomial tensor spaces and the characterization of the trace operators. First, the divdiv Hilbert complex and its corresponding polynomial complexes are presented. Several decompositions of polynomial vector and tensors spaces are derived from the polynomial complexes. Then, traces for div-div operator are characterized through a Green's identity. Besides the normal-normal component, another trace involving combination of first order derivatives of the tensor is continuous across the face. Due to the smoothness of polynomials, the symmetric tensor element is also continuous at vertices, and on the plane orthogonal to each edge. Third, a finite element for sym curl-conforming trace-free tensors is constructed following the same approach. Finally, a finite element divdiv complex, as well as the bubble functions complex, in three dimensions are established.

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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