scholarly journals Bayesian optimization of traveling wave-like wall deformation for friction drag reduction in turbulent channel flow

2021 ◽  
Vol 16 (4) ◽  
pp. JFST0024-JFST0024
Author(s):  
Yusuke NABAE ◽  
Koji FUKAGATA
Keyword(s):  
Drag Reduction ◽  
Channel Flow ◽  
Traveling Wave ◽  
Turbulent Channel Flow ◽  
Bayesian Optimization ◽  
Friction Drag ◽  
Wall Deformation ◽  
Friction Drag Reduction

Suboptimal control of turbulent channel flow for drag reduction

1998 ◽  
Vol 358 ◽  
pp. 245-258 ◽  
Author(s):  
CHANGHOON LEE ◽  
JOHN KIM ◽  
HAECHEON CHOI
Keyword(s):  
Shear Stress ◽  
Feedback Control ◽  
Drag Reduction ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Suboptimal Control ◽  
Local Distribution ◽  
Friction Drag ◽  
Control Laws ◽  
Simple Feedback

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.

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