Effect of active control on optimal structures in wall turbulence

B. Q. Deng; C. X. Xu; W. X. Huang; G. X. Cui

Effect of active control on optimal structures in wall turbulence

B. Q. Deng, C. X. Xu, W. X. Huang, G. X. Cui

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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.

Original language	English (US)
Title of host publication	International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Publisher	TSFP-8
ISBN (Electronic)	9780000000002
State	Published - 2013
Externally published	Yes
Event	8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France Duration: Aug 28 2013 → Aug 30 2013

Publication series

Name	International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Volume	3

Other

Other	8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Country	France
City	Poitiers
Period	8/28/13 → 8/30/13

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Effect of active control on optimal structures in wall turbulence. / Deng, B. Q.; Xu, C. X.; Huang, W. X.; Cui, G. X.

International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. TSFP-8, 2013. (International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013; Vol. 3).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Deng, BQ, Xu, CX, Huang, WX & Cui, GX 2013, Effect of active control on optimal structures in wall turbulence. in International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, vol. 3, TSFP-8, 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, Poitiers, France, 8/28/13.

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abstract = "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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year = "2013",

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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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