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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

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

pages 425-430
DOI: 10.1615/TSFP5.650
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摘要

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.

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