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首页> 外文期刊>International Journal of Heat and Mass Transfer >A modification to extended proper orthogonal decomposition-based correlation analysis: The spatial consideration
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A modification to extended proper orthogonal decomposition-based correlation analysis: The spatial consideration

机译：扩展适当正交分解相关分析的修改：空间考虑

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摘要

The so-called proper orthogonal decomposition (POD) method has been used in numerous research items, mainly in the field of turbulence, as a reduced-order model to describe transient complex turbulence by a set of deterministic functions. One of the modifications of POD known as the extended POD method (EPOD) has been successfully used mainly to analyse correlations between the flow field and synchronized vector or scalar fields such as correlations between velocity and temperature fields. However, its bottleneck in the correlation identification is demonstrated in this paper, and then the issue is addressed by a suitable modification. For this, a set of unsteady fully turbulent simulation results in the presence of different arrays of vortex generators, enhancing heat transport, is analysed by POD and EPOD. As a major result, a spatial filtering procedure is proposed to be applied prior to EPOD analysis. It is demonstrated that, in contrast to a conventional application of EPOD, the proposed procedure enables correct separation of thermally active and inactive flow modes.
机译：所谓的适当正交分解（POD）方法已在许多研究项目中使用，主要是在湍流领域，作为减少阶模型，以通过一组确定性功能描述瞬态复杂湍流。被称为扩展POD方法（EPOD）的POD的修改之一已经成功地主要用于分析流场和同步矢量或标量场之间的相关性，例如速度和温度场之间的相关性。然而，在本文中对相关识别进行了瓶颈，然后通过合适的修改来解决问题。为此，通过POD和EPOD分析了一组不稳定的完全湍流仿真导致不同涡流发生器阵列的存在，增强热传输。作为主要结果，提出了在EPOD分析之前应用的空间滤波过程。结果表明，与EPOD的常规应用相比，所提出的程序能够正确地分离热活性和无活性的流动模式。

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