Statistical properties of thermodynamic fluctuations in compressible wall⁃bounded turbulence

被引：0
|
作者：
Fu Y. [1 ]
Yuan X. [1 ]
Liu P. [1 ]
Yu M. [1 ]
机构：
[1] State Key Laboratory of Aerodynamics, Mianyang
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 09期
基金：
中国国家自然科学基金;
关键词：
coherent structures; compressible wall-bounded turbulence; direct numerical simulation; statistical properties; thermodynamic variables; turbulent transport;
D O I：
10.7527/S1000-6893.2022.27217
中图分类号：
学科分类号：
摘要：
The statistical properties of velocity fluctuations have been widely investigated in compressible wall-bounded turbulence. However，fluctuations of thermodynamic variables and their correlations require further under⁃ standing. This study exploits the direct numerical simulation databases to systematically investigate the effects of Mach numbers and wall temperatures on coherent structures and statistical properties（e. g. ，root-mean-square，skewness/ flatness factor，correlation）of thermodynamic variables（e. g. ，temperature，entropy，density and pressure）. It is found that the compressibility effects have significant influence on coherent structures and statistical properties in the near-wall region，manifested as stronger positive density/pressure fluctuations associated with strong compressive events，resulting in higher skewness and flatness that indicate stronger asymmetry and intermittency. Nevertheless，in the outer region，coherent structures and statistical properties of temperature/entropy/density fluctuations with different Mach numbers and wall temperatures show a similar trend with a strong correlation. In addition，velocity fluctuations have similar effects on the transport of temperature/entropy fluctuations，indicating that entropy fluctuations can be modeled in the same way as temperature fluctuations. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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