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The bypass transition mechanism of the Stokes boundary layer in the intermittently turbulent regime

Published online by Cambridge University Press:  27 May 2020

Chengwang Xiong
Affiliation:
College of Shipbuilding Engineering, Harbin Engineering University, 150001Harbin, PR China School of Civil Engineering, Hebei University of Technology, 300401Tianjin, PR China
Xiang Qi
Affiliation:
School of Civil Engineering, Hebei University of Technology, 300401Tianjin, PR China
Ankang Gao
Affiliation:
State Key Laboratory for Turbulence and Complex Systems (LTCS), Peking University, 100871Beijing, PR China
Hui Xu
Affiliation:
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, PR China
Chengjiao Ren
Affiliation:
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, 116024Dalian, PR China
Liang Cheng*
Affiliation:
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, 116024Dalian, PR China School of Civil, Environmental and Mining Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA6009, Australia
*
Email address for correspondence: liang.cheng@uwa.edu.au

Abstract

This numerical study focuses on the coherent structures and bypass transition mechanism of the Stokes boundary layer in the intermittently turbulent regime. In particular, the initial disturbance is produced by a temporary roughness element that is removed immediately after triggering a two-dimensional vortex tube under an inflection-point instability. The present study reveals a complete scenario of self-induced motion of a vortex tube after rollup from the boundary layer. The trajectory of the vortex tube is reasonably described based on the Helmholtz point-vortex equation. The three-dimensional transition of the vortex tube is attributed to the Crow instability, which leads to a sinusoidal disturbance that eventually evolves into a ring-like structure, especially for the weaker vortex. Further investigation demonstrates that three-dimensional or quasi-three-dimensional vortex perturbations in the free stream play a critical role in the boundary layer transition through a bypass mechanism, which is featured by the non-modal and explosive transient growth of the subsequent boundary layer instabilities. This transition scenario is found to be analogous to the oblique transition in the steady boundary layer, both of which are characterised by the formation of streaks, rollup of hairpin-like vortices and burst into turbulent spots. In addition, the streamwise propagation of turbulent spots is discussed in detail. To shed more light on the nature of the intermittently turbulent Stokes boundary layer, a conceptual model is proposed for the periodically self-sustaining mechanism of the turbulent spots based on the present numerical results and experimental evidence reported in the literature.

Type
JFM Papers
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Xiong et al. supplementary movie 1

(fig. 18) The video illustrating the propagation of turbulent spots in the moving reference frame $\hat{S}$. Case 16, $Re = 600$ and $h=0.5$.

Download Xiong et al. supplementary movie 1(Video)
Video 2 MB

Xiong et al. supplementary movie 2

Experimental visualizations are reproduced from supplementary movie 3 of Carstensen et al. (2010) to demonstrate the inception, growth and breakdown of turbulent spots in accordance with figure 21.

Download Xiong et al. supplementary movie 2(Video)
Video 172 KB

Xiong et al. supplementary movie 3

The comparison of the trajectory of the vortex pair and the inception of turbulent spots between the ones generated by a fixed roughness element and the counterparts by a temporary roughness element.

Download Xiong et al. supplementary movie 3(Video)
Video 203 KB
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