Estimation of the dissipation rate of turbulent kinetic energy: A review
Estimation of the dissipation rate of turbulent kinetic energy: A review
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DOI：
10.1016/j.ces.2020.116133
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发表时间：
2021-01
影响因子：
4.7
通讯作者：
Guichao Wang;Fan Yang;Ke Wu;Yong-Feng Ma;Cheng Peng;Tianshu Liu;Lian-Ping Wang
中科院分区：
文献类型：
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作者：
Guichao Wang;Fan Yang;Ke Wu;Yong-Feng Ma;Cheng Peng;Tianshu Liu;Lian-Ping Wang
一个全面的文献综述的湍流动能耗散率的估计，以评估在这方面的现有知识。对测量湍流耗散率的实验技术（热线、LDV、PIV和PTV）的速度处理方法进行了分析。传统的热线和LDV都是一种基于点的测量技术，具有高的时间分辨率和泰勒的冻结假设，通常需要转换到空间的湍流速度波动的时间速度波动。利用多热线探头和多点LDV测量速度空间梯度，可以直接从湍流耗散率的定义出发计算湍流耗散率。然而，只有PIV和PTV可以同时测量湍流场中的湍流耗散率分布。这些方法都遭受空间分辨率的不足，因为需要速度测量来解析到Kolmogorov尺度，以便从波动的速度梯度严格地直接计算湍流耗散率。为了消除分解到Kolmogorov尺度的必要性，可以使用大涡模拟类比和Smagorinsky模式来估计未分解的小尺度，但Smagorinsky常数在此阶段作为调整参数。比较了不同的速度处理方法在湍流耗散率估算中的应用。用结构函数、能谱和量纲分析方法估算湍流耗散率可以减小低分辨率的影响，但只能提供时间或空间平均的湍流耗散率。湍流耗散率场具有间歇性的时空分布特征，且分布不均匀。本文的目的是回顾现有的实验技术和不同的计算方法的发展和局限性，并确定未来的发展方向，成功地估计湍流多相流中的湍流耗散率。
A comprehensive literature review on the estimation of the dissipation rate of turbulent kinetic energy is presented to assess the current state of knowledge available in this area. Experimental techniques (hot wires, LDV, PIV and PTV) reported on the measurements of turbulent dissipation rate have been critically analyzed with respect to the velocity processing methods. Traditional hot wires and LDV are both a point-based measurement technique with high temporal resolution and Taylor’s frozen hypothesis is generally required to transfer temporal velocity fluctuations into spatial velocity fluctuations in turbulent flows. Multi probes of hot wires and multi points LDV could be used to measure velocity spatial gradients for a direct calculation of turbulent dissipation rate from its definition. Nevertheless, only PIV and PTV could provide simultaneous measurements of the distribution of turbulent dissipation rate in a turbulent field. These methods all suffer from the deficiency of spatial resolution as velocity measurements are required to resolve down to Kolmogorov scales for a strictly direct calculation of turbulent dissipation rate from fluctuating velocity gradients. To eliminate the necessity of resolving down to Kolmogorov scales, a large eddy simulation analogy and Smagorinsky model could be used for estimating the unresolved small scales, but Smagorinsky constant acts as an adjustment parameter at this stage. Different velocity processing methods are compared in the estimation of turbulent dissipation rate. The estimation of turbulent dissipation rate using structure function, energy spectrum and dimensional analysis methods could reduce the effects of low resolution, but it only provides temporal or spatial mean turbulent dissipation rate. Nevertheless, the field of turbulent dissipation rate, which is not distributed homogeneously, has intermittent spatio-temporal nature. The aim of this paper is to review the developments and limitations of the existing experimental techniques and different calculating methods and identify the future directions in successfully estimating turbulent dissipation rate in turbulent multiphase flows.