Properties of the compressibility and transport motion in wall-bounded turbulent flows at Mach 8

Xin Li, Siyuan Zhang, Junyi Duan, Xiaobo Liu and Wanghao Wu
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Xin Li: Shanghai Electromechanical Engineering Institute, Shanghai 201109, P. R. China
Siyuan Zhang: ��School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
Junyi Duan: ��LHD, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China§School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Xiaobo Liu: Shanghai Electromechanical Engineering Institute, Shanghai 201109, P. R. China
Wanghao Wu: Shanghai Electromechanical Engineering Institute, Shanghai 201109, P. R. China

International Journal of Modern Physics C (IJMPC), 2022, vol. 33, issue 07, 1-17

Abstract: The compressibility effect and transport motion in highspeed turbulent boundary layer (TBL) is a fundamental problem because they dominate the average and statistical characteristics. Using the statistical methods and flow visualization technology, flat-plate TBLs at Ma∞=8 with high- and low-wall temperatures, Tw∕T∞=10.03 and 1.9, are investigated based on the direct numerical simulation (DNS) datasets. Compared with previous studies, this study considers relative higher Mach number and strong cold wall temperature condition at the same time. First, the turbulent Mach number and turbulent intensity show that the compressibility effects are enhanced by the cooling process. Second, the high-order statistical moments and structure parameters confirm cold wall that causes stronger compressibility and the corresponding increased intensities of local streamwise and wall-normal transport motions. Finally, for uncovering the relationship between the compressibility effect and turbulent transport, more in-depth visualization analyses of velocity streaks are performed. It is found that ‘knot-like’ structures are generated when cooling the wall, and they lead to stronger intermittent, which results in the rapid increase of local compressibility effect and the wall-normal transport motion. Our research sheds light on providing a theoretical basis for further understanding the compressibility effects of TBL at high Mach number.

Keywords: Direct numerical simulation; turbulent boundary layer; wall temperature effect; high Mach number (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0129183122500905

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