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arXiv 1205.3085math.NAcs.NA
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H(div)和H(curl)协调有限元的高效组装

Efficient Assembly of H(div) and H(curl) Conforming Finite Elements

University of Oslo(奥斯陆大学);Texas Tech University(德克萨斯理工大学);Simula Research Laboratory(西姆拉研究实验室)

Marie Rognes, Robert C. Kirby, Anders Logg

AI总结:

本文提出一种基于参考张量和几何张量分解的策略,结合Piola映射和简单编号方案,实现H(div)和H(curl)有限元变分形式的高效自动组装。

摘要:

本文讨论如何高效评估和组装H(div)和H(curl)上的通用有限元变分形式。所提出的策略依赖于将单元张量分解为可预计算的参考张量和依赖于网格的几何张量。然后必须考虑两个关键点:基函数从参考单元的适当映射,以及几何实体的定向。为了解决这些问题,我们将先前提出的仿射映射单元表示定理扩展到Piola映射单元。我们还讨论了一种简单的编号策略,消除了处理面法线和切线方向的需要。结果是一种自动化、高效且易于使用的实现,允许用户以接近数学符号的形式指定H(div)和H(curl)上的有限元变分形式。

英文摘要:

In this paper, we discuss how to efficiently evaluate and assemble general finite element variational forms on H(div) and H(curl). The proposed strategy relies on a decomposition of the element tensor into a precomputable reference tensor and a mesh-dependent geometry tensor. Two key points must then be considered: the appropriate mapping of basis functions from a reference element, and the orientation of geometrical entities. To address these issues, we extend here a previously presented representation theorem for affinely mapped elements to Piola-mapped elements. We also discuss a simple numbering strategy that removes the need to contend with directions of facet normals and tangents. The result is an automated, efficient, and easy-to-use implementation that allows a user to specify finite element variational forms on H(div) and H(curl) in close to mathematical notation.

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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