arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.15032math.NAcs.NAmath.DS
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各向异性非均匀边界控制N维wave equation作为端口-哈密顿系统的保结构空间离散的数值分析

Numerical analysis of a structure-preserving space-discretization for an anisotropic and heterogeneous boundary controlled N-dimensional wave equation as port-Hamiltonian system

Ghislain Haine, Denis Matignon, Anass Serhani

摘要:

将各向异性、非均匀的$N$维波动方程视为一个端口-哈密顿系统,在边界上进行控制和观测。最近的结构保持混合Galerkin方法的应用,直接导致一个有限维端口哈密顿系统:其数值分析进行了一般的框架。混合有限元的最佳选择,然后证明达到最佳的折衷之间的收敛速度和自由度的状态误差。Exta相容性条件确定的哈密顿误差是两倍的状态误差,并提供了数值证据表明,某些组合的有限元家庭满足这些条件。通过二维的数值模拟,对经典有限元族中的主要定理进行了说明。提供了几种测试情况,包括非凸区域、各向异性或各向异性情况以及吸收边界条件。

英文摘要:

The anisotropic and heterogeneous $N$-dimensional wave equation, controlled and observed at the boundary, is considered as a port-Hamiltonian system. A recent structure-preserving mixed Galerkin method is applied, leading directly to a finite-dimensional port-Hamiltonian system: its numerical analysis is carried out in a general framework. Optimal choices of mixed finite elements are then proved to reach the best trade-off between the convergence rate and the number of degrees of freedom for the state error. Exta compatibility conditions are identified for the Hamiltonian error to be twice that of the state error, and numerical evidence is provided that some combinations of finite element families meet these conditions. Numerical simulations in 2D are performed to illustrate the main theorems among several choices of classical finite element families. Several test cases are provided, including non-convex domain, anisotropic or hetergoneous cases and absorbing boundary conditions.

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