Journal
JOURNAL OF FLUID MECHANICS
Volume 702, Issue -, Pages 403-414Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2012.189
Keywords
drag reduction; turbulence control
Categories
Funding
- EPSRC [EP/G060215/1]
- Airbus Operations Ltd
- EADS UK Ltd
- EPSRC [EP/G038686/1, EP/G069581/1, EP/G061556/1, EP/G060215/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G069581/1, EP/G038686/1, EP/G060215/1, EP/G061556/1] Funding Source: researchfish
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Linearized Navier-Stokes equations are solved to investigate the impact on the growth of near-wall turbulent streaks that arises from streamwise-travelling waves of spanwise wall velocity. The percentage change in streak amplification due to the travelling waves, over a range of wave parameters, is compared to published direct numerical simulation (DNS) predictions of turbulent skin-friction reduction; a clear correlation between the two is observed. Linearized simulations at a much higher Reynolds number, more relevant to aerospace applications, produce results that show no marked differences to those obtained at low Reynolds number. It is also observed that there is a close correlation between DNS data of drag reduction and a very simple characteristic of the 'generalized' Stokes layer generated by the streamwise-travelling waves.
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