Boundary Layer Control for Drag Reduction by Lorentz Forcing

2008 ◽  
pp. 259-265 ◽  
Author(s):  
Peng Xu ◽  
Kwing-So Choi
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
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.

scholarly journals Drag Reduction of High Altitude Airships by Active Boundary Layer Control. Effect of a Cusp on the Reduction.

1998 ◽  
Vol 64 (618) ◽  
pp. 412-419 ◽  
Author(s):  
Norihiro YAMAMURA ◽  
Kazuo MATSUUCHI ◽  
Masahiko ONDA ◽  
Shinobu YAMAZAKI ◽  
Akira SASAKI
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
High Altitude ◽  
Boundary Layer Control ◽  
Control Effect ◽  
Layer Control
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