Opposition Control of Near-Wall Turbulence With a Piston Type Actuator
Opposition control of near-wall turbulence was carried out using a wall-normal jet from a piston-type actuator, by selectively canceling the downwash of high-momentum fluid during the sweep events. By...
Opposition control of near-wall turbulence was carried out using a wall-normal jet from a piston-type actuator, by selectively canceling the downwash of high-momentum fluid during the sweep events. By...
On the Coupling Between Adjacent Turbulent Jets
A detailed examination of the coupling observed between adjacent turbulent jets, one of which was externally excited, is presented. The study is relevant to the active control of combustion and mixing...
A detailed examination of the coupling observed between adjacent turbulent jets, one of which was externally excited, is presented. The study is relevant to the active control of combustion and mixing...
Towards a Greater Understanding of Turbulent Skin-Friction Reduction
Paper no. FEDSM2002-31060 pp. 1449-1454
doi:10.1115/FEDSM2002-31060
ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
(FEDSM2002)
July 14–18, 2002 , Montreal, Quebec, Canada Sponsor: Fluids Engineering Division
July 14–18, 2002 , Montreal, Quebec, Canada Sponsor: Fluids Engineering Division
Volume 1: Fora, Parts A and B
ISBN: 0-7918-3615-0
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Measurements have been made in a turbulent boundary layer modified by flow aligned vertical (sub-boundary layer) elements. Comparisons between the coherent structure (near-wall and outer-layer region) for both modified and canonical cases have been conducted in order to better understand the mechanism of skin friction reduction. Thus far we can report a modified near-wall convection velocity obeying inner scaling and a reduced spread of correlated events away from the wall. The outer-layer appears to be characterised by large-scale arch-like structures which produce a velocity field consistent with the heads of lifted near-wall horseshoe vortices. The modified case shows reduced convection velocity, increased frequency of occurrence and increased entrainment for this type of outer-layer event.
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