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http://dx.doi.org/10.3795/KSME-B.2002.26.2.345

Assessment of Suboptimal Control in Turbulent Pipe Flow  

Choe, Jeong-Il (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Xu, C.X. (Dept. of Eng, Mech., Tsinghua Univ. CHINA)
Seong, Hyeong-Jin (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.26, no.2, 2002 , pp. 345-352 More about this Journal
Abstract
A suboptimal control law in turbulent pipe flow is derived and tested. Two sensing variables ∂p/∂$\theta$│$\_$w/ and ∂v$\_$$\theta$/∂γ│$\_$w/ are applied with two actuations ø$\_$$\theta$/ and ø$\_$γ/. To test the suboptimal control law, direct numerical simulations of turbulent pipe flow at Re$\_$$\tau$/=150 are performed. When the control law is applied, a 13∼23% drag reduction is achieved. The most effective drag reduction is made at the pair of ∂v$\_$$\theta$/∂γ│$\_$w/ and ø$\_$γ/. An impenetrable virtual wall concept is useful for analyzing the near-wall suction and blowing. The virtual wall concept is useful for analyzing the near-wall behavior of the controlled flow. Comparison of the present suboptimal control with that of turbulent channel flow reveals that the curvature effect is insignificant.
Keywords
Suboptimal Control; Drag Reduction; Turbulent Pipe Flow;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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