Scale properties of turbulent transport and coherent structure in stably stratified flows

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• 作者：Long Zhu ; Xiang Qiu ; Jianping Luo ; Yulu Liu
• 关键词：stratified turbulence ; coherent structure ; counter ; gradient transport (CGT) ; empirical mode decomposition (EMD)
• 刊名：Applied Mathematics and Mechanics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：37
• 期：4
• 页码：443-458
• 全文大小：1,910 KB
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• 作者单位：Long Zhu (1)
  Xiang Qiu (2)
  Jianping Luo (1)
  Yulu Liu (1) (3)
  
  1. School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai, 201418, China
  2. School of Science, Shanghai Institute of Technology, Shanghai, 201418, China
  3. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, 200072, China
  
• 刊物类别：Mathematics and Statistics
• 刊物主题：Mathematics
  Applications of Mathematics
  Mechanics
  Mathematical Modeling and IndustrialMathematics
  Chinese Library of Science
  
• 出版者：Shanghai University, in co-publication with Springer
• ISSN：1573-2754

文摘

The empirical mode decomposition (EMD) is used to study the scale properties of turbulent transport and coherent structures based on velocity and temperature time series in stably stratified turbulence. The analysis is focused on the scale properties of intermittency and coherent structures in different modes and the contributions of energy-contained coherent structures to turbulent scalar counter-gradient transport (CGT). It is inferred that the velocity intermittency is scattered to more modes with the development of the stratified flow, and the intermittency is enhanced by the vertical stratification, especially in small scales. The anisotropy of the field is presented due to different time scales of coherent structures of streamwise and vertical velocities. There is global counter-gradient heat transport close to the turbulence-generated grid, and there is local counter-gradient heat transport at certain modes in different positions. Coherent structures play a principal role in the turbulent vertical transport of temperature.