Suscripción a Biblioteca: Guest
TSFP DL Home Archivos Comité Ejecutivo

EFFECT OF ACTIVE CONTROL ON OPTIMAL STRUCTURES IN WALL TURBULENCE

B.-Q. Deng
Department of Engineering Mechanics Tsinghua University Beijing, 100084, P. R. China

C. X. Xu
Department of Engineering Mechanics Tsinghua University Beijing 100084, P. R. China

Weixi Huang
Department of Engineering Mechanics Tsinghua University Beijing 100084, PR China

Guixiang Cui
Department of Engineering Mechanics, Tsinghua University, Beijing, China 100084

Sinopsis

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.