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TURBULENCE CONTROL FOR SKIN-FRICTION DRAG REDUCTION: POTENTIALS AND LIMITATIONS

Yongmann M. Chung
School of Engineering and Centre for Scientific Computing University of Warwick Coventry CV4 7AL, UK

Seo Yoon Jung
Mechanical Engineering, Imperial College London London, SW7 2AZ, U.K.; Advanced Reactor Development Institute Korea Atomic Energy Research Institute 898-111, Daedeok-daero, Daejeon 305-353, Korea

Résumé

Potentials and limitations of turbulence drag reduction control are investigated using direct numerical simulations (DNS) of a turbulent boundary layer. Wall blowing and suction are applied using the opposition control strategy. The optimal wall blowing and suction condition for effective drag reduction control is investigated. The sensitivity of the wall blowing and suction control are investigated. The effect of the blowing and suction strength is found less important than the phase information. It is found that the opposition control is very sensitive to the spanwise alignment of the wall blowing and suction. The effectiveness of MEMS devices for flow control has also been investigated using DNS. It is found that a loss of the control surface results in a substantial decrease of the drag reduction.