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A pulse size estimation method for reduced-order models

机译:降阶模型的脉冲大小估计方法

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摘要

Model-Order Reduction (MOR) is an important technique that allows Reduced-Order Models (ROMs) of physical systems to be generated that can capture the dominant dynamics, but at lower cost than the full order system. One approach to MOR that has been successfully implemented in fluid dynamics is the Eigensystem Realization Algorithm (ERA). This method requires only minimal changes to the inputs and outputs of a CFD code so that the linear responses of the system to unit impulses on each input channel can be extracted. One of the challenges with the method is to specify the size of the input pulse. An inappropriate size may cause a failure of the code to converge due to non-physical behaviour arising during the solution process. This paper addresses this issue by using piston theory to estimate the appropriate input pulse size.
机译:降阶模型(MOR)是一项重要技术,它允许生成物理系统的降阶模型(ROM),该模型可以捕获主要动态,但成本要低于全阶系统。一种已成功地在流体动力学中实现的MOR方法是本征系统实现算法(ERA)。这种方法只需要对CFD代码的输入和输出进行最小的更改,从而可以提取系统对每个输入通道上单位脉冲的线性响应。该方法的挑战之一是指定输入脉冲的大小。不适当的大小可能会由于解决过程中出现的非物理行为而导致代码无法收敛。本文通过使用活塞理论来估计适当的输入脉冲大小来解决此问题。

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