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On the turbulence amplification in shock-wave/turbulent boundary layer interaction

Fang, Jian; Zheltovodov, Aleksandr A.; Yao, Yufeng; Moulinec, Charles; Emerson, David R.

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Authors

Jian Fang

Aleksandr A. Zheltovodov

Yufeng Yao Yufeng.Yao@uwe.ac.uk
Professor in Aerospace Engineering

Charles Moulinec

David R. Emerson



Abstract

The mechanism of turbulence amplification in shock-wave/boundary layer interactions is reviewed, and a new turbulence amplification mechanism is proposed based on the analysis of data from direct numerical simulation of an oblique shock-wave/flat-plate boundary layer interaction at Mach 2.25. In the upstream part of the interaction zone, the amplification of turbulence is not essentially shear driven, but induced by the interaction of the deceleration of mean flow with streamwise velocity fluctuations, which causes a rapid increase of turbulence intensity in the near-wall region. In the downstream part of the interaction zone, the high turbulence intensity is mainly due to the free shear layer generated in the interaction zone. During the initial stage of turbulence amplification, the characteristics of wall turbulence, including compact velocity streaks, streamwise vortices and an anisotropic Reynolds stress, are well preserved. The mechanism proposed explains the high level of turbulence in the near-wall region observed in some experiments and numerical simulations.

Citation

Fang, J., Zheltovodov, A. A., Yao, Y., Moulinec, C., & Emerson, D. R. (2020). On the turbulence amplification in shock-wave/turbulent boundary layer interaction. Journal of Fluid Mechanics, 897, https://doi.org/10.1017/jfm.2020.350

Journal Article Type Article
Acceptance Date Apr 26, 2020
Online Publication Date Jun 18, 2020
Publication Date Aug 25, 2020
Deposit Date Jun 22, 2020
Publicly Available Date Jun 23, 2020
Journal Journal of Fluid Mechanics
Print ISSN 0022-1120
Electronic ISSN 1469-7645
Publisher Cambridge University Press (CUP)
Peer Reviewed Peer Reviewed
Volume 897
Article Number A32
DOI https://doi.org/10.1017/jfm.2020.350
Keywords Mechanical Engineering; Mechanics of Materials; Condensed Matter Physics; High-Speed Flow; Shock Waves; Compressible Turbulence
Public URL https://uwe-repository.worktribe.com/output/6037365

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