Imperial College London
Alternate

Dr. Yongyun Hwang

Faculty of Engineering, Department of Aeronautics

Reader in Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5078y.hwang

 
 
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Location

 

337City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Doohan:2019:10.1017/jfm.2019.472,
author = {Doohan, P and Willis, A and Hwang, Y},
doi = {10.1017/jfm.2019.472},
journal = {Journal of Fluid Mechanics},
pages = {606--638},
title = {Shear stress-driven flow: the state space of near-wall turbulence as Reτ →∞},
url = {http://dx.doi.org/10.1017/jfm.2019.472},
volume = {874},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - An inner-scaled, shear stress-driven flow is considered as a model of independentnear-wall turbulence as Reτ → ∞. In this limit, the model is applicable to the nearwall region and the lower part of the logarithmic layer of various parallel shear flows,including turbulent Couette flow, Poiseuille flow and Hagen-Poiseuille flow. The modelis validated against damped Couette flow and there is excellent agreement between thevelocity statistics and spectra for y+ < 40. A near-wall flow domain of similar size tothe minimal unit is analysed from a dynamical systems perspective. The edge and fifteeninvariant solutions are computed, the first discovered for this flow configuration. Throughcontinuation in the spanwise width L+z, the bifurcation behaviour of the solutions overthe domain size is investigated. The physical properties of the solutions are exploredthrough phase portraits, including the energy input and dissipation plane, and streak,roll and wave energy space. Finally, a Reynolds number is defined in outer units and thehigh-Re asymptotic behaviour of the equilibria is studied. Three lower branch solutionsare found to scale consistently with vortex-wave interaction (VWI) theory, with waveforcing localising around the critical layer.
AU  - Doohan,P
AU  - Willis,A
AU  - Hwang,Y
DO  - 10.1017/jfm.2019.472
EP  - 638
PY  - 2019///
SN  - 0022-1120
SP  - 606
TI  - Shear stress-driven flow: the state space of near-wall turbulence as Reτ →∞
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2019.472
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/shear-stressdriven-flow-the-state-space-of-nearwall-turbulence-as-reunicodestixx1d70frightarrow-infty/01EBEE3E1575D7260BDEB16E929AA013
UR  - http://hdl.handle.net/10044/1/71847
VL  - 874
ER  -
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