Turbulent Boundary-Layer Control for Drag Reduction Using Surface Plasma

2004 ◽  
Author(s):  
Tim Jukes ◽  
Kwing-So Choi ◽  
Graham Johnson ◽  
Simon Scott
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Drag Reduction ◽  
Boundary Layer Control ◽  
Surface Plasma ◽  
Layer Control

Turbulent boundary layer control utilizing the Lorentz force

2000 ◽  
Vol 12 (3) ◽  
pp. 631-649 ◽  
Author(s):  
Timothy W. Berger ◽  
John Kim ◽  
Changhoon Lee ◽  
Junwoo Lim
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Lorentz Force ◽  
Boundary Layer Control ◽  
Layer Control

Physics and control of wall turbulence for drag reduction

2011 ◽  
Vol 369 (1940) ◽  
pp. 1396-1411 ◽  
Author(s):  
John Kim
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Skin Friction ◽  
Linear Analysis ◽  
Wall Turbulence ◽  
Boundary Layer Control ◽  
Control Input ◽  
Friction Drag ◽  
Nonlinear Simulations ◽  
Layer Control

Turbulence physics responsible for high skin-friction drag in turbulent boundary layers is first reviewed. A self-sustaining process of near-wall turbulence structures is then discussed from the perspective of controlling this process for the purpose of skin-friction drag reduction. After recognizing that key parts of this self-sustaining process are linear, a linear systems approach to boundary-layer control is discussed. It is shown that singular-value decomposition analysis of the linear system allows us to examine different approaches to boundary-layer control without carrying out the expensive nonlinear simulations. Results from the linear analysis are consistent with those observed in full nonlinear simulations, thus demonstrating the validity of the linear analysis. Finally, fundamental performance limit expected of optimal control input is discussed.

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