Implementation of Neural Networks for Active Near Wall Turbulence Control

2006 ◽  
Author(s):  
Li Lorang Vodinh ◽  
Bérengère Podvin ◽  
Patrick Le Quéré
Keyword(s):  
Neural Networks ◽  
Wall Turbulence ◽  
Turbulence Control ◽  
Near Wall Turbulence ◽  
Near Wall

Opposition Control of Near-Wall Turbulence With a Piston Type Actuator

2002 ◽  
Author(s):  
Henry Rebbeck ◽  
Kwing-So Choi
Keyword(s):  
High Frequency ◽  
Wall Turbulence ◽  
Real Time Control ◽  
Turbulence Control ◽  
Frequency Responses ◽  
Time Control ◽  
Innovative Methodology ◽  
Near Wall Turbulence ◽  
Near Wall ◽  
Opposition Control

Opposition control of near-wall turbulence was carried out using a wall-normal jet from a piston-type actuator, by selectively canceling the downwash of high-momentum fluid during the sweep events. By employing an innovative methodology we were able to study the effectiveness of the scheme without carrying out real-time control, overcoming experimental difficulties associated with the high frequency responses required for the turbulence control. Observed changes of the burst signature in the turbulent boundary layer suggest that there is a possibility of reducing the skin-friction drag when opposition control is carried out with appropriate timing.

Mechanism of control of the near-wall turbulence using a micro-cavity array

2021 ◽  
Vol 33 (7) ◽  
pp. 075114
Author(s):  
S. S. Bhat ◽  
A. Silvestri ◽  
B. S. Cazzolato ◽  
M. Arjomandi
Keyword(s):  
Wall Turbulence ◽  
Micro Cavity ◽  
Near Wall Turbulence ◽  
Cavity Array ◽  
Near Wall

scholarly journals Minimal multi-scale dynamics of near-wall turbulence

2021 ◽  
Vol 913 ◽  
Author(s):  
Patrick Doohan ◽  
Ashley P. Willis ◽  
Yongyun Hwang
Keyword(s):  
Wall Turbulence ◽  
Multi Scale ◽  
Near Wall Turbulence ◽  
Near Wall

Abstract

Nonlinear analysis of near-wall turbulence time series

1996 ◽  
Vol 57 (3-4) ◽  
pp. 235-261 ◽  
Author(s):  
A. Porporato ◽  
L. Ridolfi
Keyword(s):  
Time Series ◽  
Nonlinear Analysis ◽  
Wall Turbulence ◽  
Near Wall Turbulence ◽  
Near Wall
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