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Characterization of very-large-scale motions in supersonic and hypersonic turbulent boundary layers

Published online by Cambridge University Press:  26 January 2024

Ming Yu
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang 621000, PR China
SiWei Dong
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang 621000, PR China
QiLong Guo
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang 621000, PR China
ZhiGong Tang
Affiliation:
China Aerodynamics Research and Development Center, Mianyang 621000, PR China
XianXu Yuan*
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang 621000, PR China
ChunXiao Xu*
Affiliation:
Key Laboratory of Applied Mechanics, Ministry of Education, Institute of Fluid Mechanics, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, PR China
*
Email addresses for correspondence: yuanxianxu@cardc.cn, xucx@tsinghua.edu.cn
Email addresses for correspondence: yuanxianxu@cardc.cn, xucx@tsinghua.edu.cn

Abstract

Very-large-scale motions are commonly observed in moderate- and high-Reynolds-number wall turbulence, constituting a considerable portion of the Reynolds stress and skin friction. This study aims to investigate the behaviour of these motions in high-speed and high-Reynolds-number turbulent boundary layers at varying Mach numbers. With the aid of high-precision numerical simulations, numerical experiments and theoretical analysis, it is demonstrated that the very-large-scale motions are weakened in high-Mach-number turbulence at the same friction Reynolds numbers, leading to the reduction in turbulent kinetic energy in the outer region. Conversely, the lower wall temperature enhances the very-large-scale motions but shortens the scale separation between the structures in the near-wall and outer regions.

Information

Type
JFM Papers
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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