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arXiv 2002.09726math.NAcs.LGcs.NAmath.DSstat.ML
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非多项式非线性系统非侵入模型降阶的算子推理

Operator inference for non-intrusive model reduction of systems with non-polynomial nonlinear terms

Max Planck Institute for Dynamics of Complex Technical Systems(马克斯·普朗克复杂技术系统动力学研究所);University of California San Diego(加利福尼亚大学圣地亚哥分校);New York University(纽约大学);The University of Texas at Austin(得克萨斯大学奥斯汀分校)

Peter Benner, Pawan Goyal, Boris Kramer, Benjamin Peherstorfer, Karen Willcox

摘要:

本文提出了一种非侵入式的模型降阶法,用于学习具有非多项式非线性项的动力系统的低维模型,这些非多项式非线性项在空间上是局部的,并且以解析形式给出。与最先进的模型降阶法相比,该方法是侵入式的,因此需要完全了解离散化动力系统的全模型的控制方程和算子,所提出的方法仅需要解析形式的非多项式项,并从用潜在的黑盒全模型求解器计算的快照中学习其余的动力学。所提出的方法通过最小二乘问题学习线性和多项式非线性动力学的算子,其中给定的非多项式项被合并在右侧。最小二乘问题是线性的,因此在实践中可以有效地解决。所提出的方法被证明由偏微分方程,即扩散反应Chafee-Infante模型,反应流的管式反应器模型,和一个间歇色谱模型,描述了一个化学分离过程中的三个问题。数值结果提供的证据表明,所提出的方法学习降阶模型,达到相当的精度与国家的最先进的侵入性模型降阶法,需要充分的知识的控制方程的模型。

英文摘要:

This work presents a non-intrusive model reduction method to learn low-dimensional models of dynamical systems with non-polynomial nonlinear terms that are spatially local and that are given in analytic form. In contrast to state-of-the-art model reduction methods that are intrusive and thus require full knowledge of the governing equations and the operators of a full model of the discretized dynamical system, the proposed approach requires only the non-polynomial terms in analytic form and learns the rest of the dynamics from snapshots computed with a potentially black-box full-model solver. The proposed method learns operators for the linear and polynomially nonlinear dynamics via a least-squares problem, where the given non-polynomial terms are incorporated in the right-hand side. The least-squares problem is linear and thus can be solved efficiently in practice. The proposed method is demonstrated on three problems governed by partial differential equations, namely the diffusion-reaction Chafee-Infante model, a tubular reactor model for reactive flows, and a batch-chromatography model that describes a chemical separation process. The numerical results provide evidence that the proposed approach learns reduced models that achieve comparable accuracy as models constructed with state-of-the-art intrusive model reduction methods that require full knowledge of the governing equations.

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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