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arXiv 2009.11216math.NAcs.NA
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网络上一类非线性流问题的端口-Hamilton逼近

On port-Hamiltonian approximation of a nonlinear flow problem on networks

Björn Liljegren-Sailer, Nicole Marheineke

摘要:

本文系统地研究了网络上一类非线性偏微分方程的保结构逼近。例如,该类别包括由正压欧拉方程描述的天然气管网系统。我们的方法是指导整个基于能量的建模概念(端口汉密尔顿形式主义,理论的勒让德变换),它提供了一个方便和一般的推理。在温和的假设下的近似,当地的质量守恒,一个能量的限制,和继承的端口哈密顿结构可以显示。我们的方法不仅限于传统的空间离散化,但也包括复杂性降低的非线性不精确积分。因此,它可以作为结构保持模型约简的基础。结合能量稳定的时间积分,我们以欧拉方程为例,数值证明了该方法的适用性和良好的稳定性。

英文摘要:

This paper deals with the systematic development of structure-preserving approximations for a class of nonlinear partial differential equations on networks. The class includes, for example, gas pipe network systems described by barotropic Euler equations. Our approach is guided throughout by energy-based modeling concepts (port-Hamiltonian formalism, theory of Legendre transformation), which provide a convenient and general line of reasoning. Under mild assumptions on the approximation, local conservation of mass, an energy bound, and the inheritance of the port-Hamiltonian structure can be shown. Our approach is not limited to conventional space discretization but also covers complexity reduction of the nonlinearities by inexact integration. Thus, it can serve as a basis for structure-preserving model reduction. Combined with an energy stable time integration, we numerically demonstrate the applicability and good stability properties of the approach using the Euler equations as an example.

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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