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arXiv physics/0503013physics.comp-phphysics.class-ph
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原、对偶空间中麦克斯韦方程组的几何有限元离散

Geometric Finite Element Discretization of Maxwell Equations in Primal and Dual Spaces

Bo He, F. L. Teixeira

摘要:

基于麦克斯韦方程组的几何离散化方法,给出了电场强度$E$和磁场强度$H$之间的数学\textit {\}变换,记作Galerkin对偶.利用Galerkin对偶和离散Hodge算子,分别构造了离散二阶矢量波动方程的两个系统矩阵$[ X_{E}] $(原始形式)和$[ X_{H} % ] $(对偶形式).我们发现,原始公式恢复了传统的(边缘单元)有限元法(FEM),并建议了它的几何基础。另一方面,对偶公式建议了一种新的(对偶)类型的有限元法。虽然这两种公式给出了相同的动力学物理解,但零空间的维数是不同的。

英文摘要:

Based on a geometric discretization scheme for Maxwell equations, we unveil a mathematical\textit{\}transformation between the electric field intensity $E$ and the magnetic field intensity $H$, denoted as Galerkin duality. Using Galerkin duality and discrete Hodge operators, we construct two system matrices, $[ X_{E}] $ (primal formulation) and $[ X_{H} % ] $ (dual formulation) respectively, that discretize the second-order vector wave equations. We show that the primal formulation recovers the conventional (edge-element) finite element method (FEM) and suggests a geometric foundation for it. On the other hand, the dual formulation suggests a new (dual) type of FEM. Although both formulations give identical dynamical physical solutions, the dimensions of the null spaces are different.

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