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arXiv 2002.11789math.NAcs.NAphysics.flu-dyn
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基于Optimization的多运输系统模态分解

Optimization-based modal decomposition for systems with multiple transports

Julius Reiss

摘要:

基于模态的模型降阶用于降低高维系统的自由度,通常通过空间模态的线性组合来描述系统状态。输运主导的现象,普遍存在于技术和科学应用中,通常需要大量的线性模式,以获得一个小的表示误差。这种困难,即使是最简单的运输,起源于不适当的分解结构中的不定常振幅的纯空间模式。本文讨论了一种将流场分解为多个同活动标架场的方法,其中每一个运动标架都可以用几个模态来近似。将分解方法表述为一个最优化问题。不同的奇异值为基础的目标函数进行了讨论,并连接到以前的配方。提供边界处理。分解适用于一般情况下,并在技术上相关的燃烧物理流配置。

英文摘要:

Mode-based model-reduction is used to reduce the degrees of freedom of high dimensional systems, often by describing the system state by a linear combination of spatial modes. Transport dominated phenomena, ubiquitous in technical and scientific applications, often require a large number of linear modes to obtain a small representation error. This difficulty, even for the most simple transports, originates from the inappropriateness of the decomposition structure in time dependent amplitudes of purely spatial modes. In this article an approach is discussed, which decomposes a flow field into several fields of co-moving frames, where each one can be approximated by a few modes. The method of decomposition is formulated as an optimization problem. Different singular-value-based objective functions are discussed and connected to former formulations. A boundary treatment is provided. The decomposition is applied to generic cases and to a technically relevant flow configuration of combustion physics.

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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