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arXiv 2202.11229math.NAcs.NA
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凸多边形上的直接序列元和混合有限元

Direct Serendipity and Mixed Finite Elements on Convex Polygons

Todd Arbogast, Chuning Wang

摘要:

我们构造新的家庭的直接偶然性和直接混合有限元的一般平面凸多边形是$H^1$和$H(div)$符合,分别,并具有最佳的顺序的任何顺序的精度。他们有一个最小数量的自由度符合性和准确性的约束。这个名字的出现是因为形状函数直接定义在物理元素上,即,而不使用来自参考元素的映射。将有限元形函数定义为标量或向量多项式的全空间加上一个补充函数空间。直接偶然元素是德拉姆络合物中直接混合元素的先驱。的有限元的收敛性能下示出的网格中的多边形的形状的规则性假设,以及一些温和的限制的选择,可以在建设中的补充功能。在不同网格上的数值实验表明了这些新的有限元族的性能。

英文摘要:

We construct new families of direct serendipity and direct mixed finite elements on general planer convex polygons that are $H^1$ and $H(div)$ conforming, respectively, and possess optimal order of accuracy for any order. They have a minimal number of degrees of freedom subject to the conformity and accuracy constraints. The name arises because the shape functions are defined directly on the physical elements, i.e., without using a mapping from a reference element. The finite element shape functions are defined to be the full spaces of scalar or vector polynomials plus a space of supplemental functions. The direct serendipity elements are the precursors of the direct mixed elements in a de Rham complex. The convergence properties of the finite elements are shown under a regularity assumption on the shapes of the polygons in the mesh, as well as some mild restrictions on the choices one can make in the construction of the supplemental functions. Numerical experiments on various meshes exhibit the performance of these new families of finite elements.

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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