Assessment of suboptimal control for drag reduction in turbulent channel flow

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A systematic analysis is made of suboptimal control for drag reduction. The influence of the amplitude of actuation (A) and the timescale of actuation (Deltat(a)(+)) are evaluated. Two wall-sensing variables are employed, (partial derivativew/partial derivativey|(w) and partial derivativep/partial derivativez |(w)), with two actuations (phi(2) and phi(3)). To test the suboptimal control, direct numerical simulations of turbulent channel flow at Re-tau = 100 are performed in a spectral domain. It is found that the effect of A and Deltat(a)(+) on the drag reduction rate (D-r) is significant. The near-wall behaviours of the flow structure are analysed to characterize the drag reduction. An optimal timescale is obtained at Deltat(a)(+) similar or equal to 1 and Deltat(a)(+) should be less than Deltat(a)(+) similar to100. The size effect of the sensor/actuator is examined.
Publisher
IOP PUBLISHING LTD
Issue Date
2002-06
Language
English
Article Type
Article; Proceedings Paper
Keywords

WALL-BOUNDED FLOWS

Citation

JOURNAL OF TURBULENCE, v.3

ISSN
1468-5248
URI
http://hdl.handle.net/10203/13700
Appears in Collection
ME-Journal Papers(저널논문)
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