arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.05965math.NAcs.NAmath.DS
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守恒律方程组保幂离散的分区有限元法

A Partitioned Finite Element Method for power-preserving discretization of open systems of conservation laws

Flávio Luiz Cardoso-Ribeiro, Denis Matignon, Laurent Lefèvre

摘要:

本文提出了一种分布参数端口-哈密顿系统的保结构空间离散方法。所考虑的系统类是双曲型系统的两个守恒律在任意空间维度和几何。对于这些系统,分区有限元法推导出的基础上的分部积分法的两个守恒律之一写在弱形式。首先以非线性一维浅水方程(SWE)为例进行了数值模拟。然后以非线性二维慢波方程为例,对该方法进行了研究。完整推导了约化的有限维端口-哈密顿系统,并进行了数值实验。曲线(极)坐标系,空间变系数和高阶端口哈密顿系统(Euler-Bernoulli梁方程)的扩展。

英文摘要:

This paper presents a structure-preserving spatial discretization method for distributed parameter port-Hamiltonian systems. The class of considered systems are hyperbolic systems of two conservation laws in arbitrary spatial dimension and geometries. For these systems, a partioned finite element method is derived, based on the integration by parts of one of the two conservation laws written in weak form. The nonlinear 1D Shallow Water Equation (SWE) is first considered as a motivation example. Then the method is investigated on the example of the nonlinear 2D SWE. Complete derivation of the reduced finite-dimensional port-Hamiltonian system is provided and numerical experiments are performed. Extensions to curvilinear (polar) coordinate systems, space-varying coefficients and higher-order port-Hamiltonian systems (Euler-Bernoulli beam equation) are provided.

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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