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Active turbulence control for drag reduction in wall-bounded flows

Published online by Cambridge University Press:  26 April 2006

Haecheon Choi ,
Parviz Moin  and
John Kim
Haecheon Choi
Affiliation:
Center for Turbulence Research, Stanford University, Stanford, CA 94035, USA NASA Ames Research Center, Moffett Field, CA 94035, USA
Parviz Moin
Affiliation:
Center for Turbulence Research, Stanford University, Stanford, CA 94035, USA
John Kim
Affiliation:
Center for Turbulence Research, Stanford University, Stanford, CA 94035, USA Present address: Mechanical, Aerospace, and Nuclear Engineering Department, University of California, Los Angeles, CA 90024, USA.
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Abstract

The objective of this study is to explore concepts for active control of turbulent boundary layers leading to skin-friction reduction using the direct numerical simulation technique. Significant drag reduction is achieved when the surface boundary condition is modified to suppress the dynamically significant coherent structures present in the wall region. The drag reduction is accompanied by significant reduction in the intensity of the wall-layer structures and reductions in the magnitude of Reynolds shear stress throughout the flow. The apparent outward shift of turbulence statistics in the controlled flows indicates a displaced virtual origin of the boundary layer and a thickened sublayer. Time sequences of the flow fields show that there are essentially two drag-reduction mechanisms. Firstly, within a short time after the control is applied, drag is reduced mainly by deterring the sweep motion without modifying the primary streamwise vortices above the wall. Consequently, the high-shear-rate regions on the wall are moved to the interior of the channel by the control schemes. Secondly, the active control changes the evolution of the wall vorticity layer by stabilizing and preventing lifting of the spanwise vorticity near the wall, which may suppress a source of new streamwise vortices above the wall.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 262 , 3 October 1994 , pp. 75 - 110
Copyright
© 1994 Cambridge University Press

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