Suboptimal control of turbulent channel flow for drag reduction

Changhoon Lee; John Kim; Haecheon Choi

doi:10.1017/S002211209700815X

Suboptimal control of turbulent channel flow for drag reduction

Changhoon Lee, John Kim, Haecheon Choi

Department of Computational Science and Engineering

Research output: Contribution to journal › Article › peer-review

144 Citations (Scopus)

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.

Original language	English
Pages (from-to)	245-258
Number of pages	14
Journal	Journal of Fluid Mechanics
Volume	358
DOIs	https://doi.org/10.1017/S002211209700815X
Publication status	Published - 1998 Mar 10

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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