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Suboptimal control of turbulent channel flow for drag reduction

Published online by Cambridge University Press:  10 March 1998

CHANGHOON LEE ,
JOHN KIM  and
HAECHEON CHOI
CHANGHOON LEE
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA Present address: Department of Mechanical Engineering, University of Seoul, Seoul, Korea.
JOHN KIM
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA
HAECHEON CHOI
Affiliation:
Department of Mechanical Engineering, Seoul National University, Seoul, Korea
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Abstract

Two simple feedback control laws for drag reduction are derived by applying a suboptimal control theory to a turbulent channel flow. These new feedback control laws require pressure or shear-stress information only at the wall, and when applied to a turbulent channel flow at Reτ=110, they result in 16–22% reduction in the skin-friction drag. More practical control laws requiring only the local distribution of the wall pressure or one component of the wall shear stress are also derived and are shown to work equally well.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 358 , 10 March 1998 , pp. 245 - 258
Copyright
© 1998 Cambridge University Press

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