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arXiv 2105.01433math.NAcs.NAmath.OC
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大系统的模型降阶

Model Reduction for Large Scale Systems

Tim Keil, Mario Ohlberger

摘要:

基于投影的模型降阶已经成为一种成熟的技术,用于大类参数化系统的仿真。然而,一些挑战仍然存在的问题,参数化系统的解决方案流形不能很好地近似线性子空间。虽然这些模型降阶法的在线效率对于Kolmogorov n宽度快速衰减的问题是非常令人信服的,但是仍然存在主要的缺点和限制。最重要的是,在离线阶段构造简化系统对于大规模和多规模系统来说是非常消耗CPU时间和内存的。对于实际应用,因此,有必要推导出模型简化技术,不依赖于经典的离线/在线分裂,但允许更灵活地使用计算资源。在这方面,一个有前途的方法是模型简化与自适应富集。本文研究了基于Petrov-Galerkin模型降阶的置信域自适应基增广方法求解多尺度和大尺度PDE约束参数最优化问题。

英文摘要:

Projection based model order reduction has become a mature technique for simulation of large classes of parameterized systems. However, several challenges remain for problems where the solution manifold of the parameterized system cannot be well approximated by linear subspaces. While the online efficiency of these model reduction methods is very convincing for problems with a rapid decay of the Kolmogorov n-width, there are still major drawbacks and limitations. Most importantly, the construction of the reduced system in the offline phase is extremely CPU-time and memory consuming for large scale and multi scale systems. For practical applications, it is thus necessary to derive model reduction techniques that do not rely on a classical offline/online splitting but allow for more flexibility in the usage of computational resources. A promising approach with this respect is model reduction with adaptive enrichment. In this contribution we investigate Petrov-Galerkin based model reduction with adaptive basis enrichment within a Trust Region approach for the solution of multi scale and large scale PDE constrained parameter optimization.

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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