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arXiv 0707.4607math.NAcs.NA
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混合间断/连续Galerkin有限元对的LBB稳定性

LBB Stability of a Mixed Discontinuous/Continuous Galerkin Finite Element Pair

Imperial College London(帝国理工学院);Universität Potsdam(波茨坦大学)

C. J. Cotter, D. A. Ham, C. C. Pain, S. Reich

AI总结:

提出一种新的混合间断/连续Galerkin有限元对P1dg-P2,用于求解波动方程和不可压缩流方程,满足LBB稳定性条件,无伪零能模式。

摘要:

我们引入了一种新的混合间断/连续Galerkin有限元,用于求解二维和三维波动方程以及不可压缩流方程。该单元称为P1dg-P2,对速度使用间断分片线性函数,对压力使用连续分片二次函数。引入混合公式的目的是为三角形和四面体网格提供一种新的灵活单元选择,满足LBB稳定性条件,因此没有伪零能模式。我们通过二维波动方程的数值积分、二维和三维离散拉普拉斯算子的分析以及一维半离散波动方程的模态分析来证明这一特性。

英文摘要:

We introduce a new mixed discontinuous/continuous Galerkin finite element for solving the 2- and 3-dimensional wave equations and equations of incompressible flow. The element, which we refer to as P1dg-P2, uses discontinuous piecewise linear functions for velocity and continuous piecewise quadratic functions for pressure. The aim of introducing the mixed formulation is to produce a new flexible element choice for triangular and tetrahedral meshes which satisfies the LBB stability condition and hence has no spurious zero-energy modes. We illustrate this property with numerical integrations of the wave equation in two dimensions, an analysis of the resultant discrete Laplace operator in two and three dimensions, and a normal mode analysis of the semi-discrete wave equation in one dimension.

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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