TY - GEN
T1 - Effect of active control on optimal structures in wall turbulence
AU - Deng, B. Q.
AU - Xu, C. X.
AU - Huang, W. X.
AU - Cui, G. X.
PY - 2013
Y1 - 2013
N2 - The effect of active control imposed at the wall on optimal structures in wall turbulence is investigated by using a linear transient growth model. When the detection plane of the control is located in the buffer layer, the transient growth of the near-wall structures can be suppressed, but the large scale motion can hardly be influenced as the Reynolds number increases, even when the control amplitude is enhanced. When the input signal for the control is detected in the logarithm region, the transient growth of the large-scale motions can be greatly suppressed, although a new peak occurs in the transient growth rate due to the strong blowing and suction at the wall. The results indicate that the flow information in the logarithmic region is crucial for constructing a control scheme to effectively manipulate the large-scale motions.
AB - The effect of active control imposed at the wall on optimal structures in wall turbulence is investigated by using a linear transient growth model. When the detection plane of the control is located in the buffer layer, the transient growth of the near-wall structures can be suppressed, but the large scale motion can hardly be influenced as the Reynolds number increases, even when the control amplitude is enhanced. When the input signal for the control is detected in the logarithm region, the transient growth of the large-scale motions can be greatly suppressed, although a new peak occurs in the transient growth rate due to the strong blowing and suction at the wall. The results indicate that the flow information in the logarithmic region is crucial for constructing a control scheme to effectively manipulate the large-scale motions.
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M3 - Conference contribution
AN - SCOPUS:85034111394
T3 - International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
BT - International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
PB - TSFP-8
T2 - 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Y2 - 28 August 2013 through 30 August 2013
ER -