Suscripción a Biblioteca: Guest
Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

PARAMETRIC STUDY ON SUBOPTIMAL CONTROL FOR DRAG REDUCTION IN TURBULENT CHANNEL FLOW

pages 11-16
DOI: 10.1615/TSFP2.1650
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SINOPSIS

A systematic analysis is made of suboptimal control for drag reduction. The influence of the amplitude of actuation (A) and the time scale of actuation (Δta+) is evaluated. Two wall sensing variables are employed (dω/dy|ω and (dp/dz|ω), with two actuations (2 and 3). It is found that the effect of A and Δta+ on the drag reduction rate (Dr) is significant. The near-wall behaviors of flow structure are analyzed to characterize the drag reduction. An optimal time scale is obtained at (Δta) ~ 1.

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