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Proportional feedback control of laminar flow over a hemisphere

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Abstract

In the present study, we perform a proportional feedback control of laminar flow over a hemisphere at Re = 300 to reduce its lift fluctuations by attenuating the strength of the vortex shedding. As a control input, blowing/suction is distributed on the surface of hemisphere before the separation, and its strength is linearly proportional to the transverse velocity at a sensing location in the centerline of the wake. The sensing location is determined based on a correlation function between the lift force and the time derivative of sensing velocity. The optimal proportional gains for the proportional control are obtained for the sensing locations considered. The present control successfully attenuates the velocity fluctuations at the sensing location and three dimensional vortical structures in the wake, resulting in the reduction of lift fluctuations of hemisphere.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Ajou University, Suwon, 443-749, Korea

    Jungil Lee

  2. Severe Accident and PHWR Safety Research Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 305-353, Korea

    Donggun Son

Authors
  1. Jungil Lee
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  2. Donggun Son
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Correspondence to Jungil Lee.

Additional information

Recommended by Associate Editor Donghyun You

Jungil Lee obtained his B.S. and Ph.D. degrees at the Department of Mechanical Engineering, Seoul National University, Korea, in 2003 and 2010, respectively. Dr. Lee is currently an Assistant Professor at the Department of Mechanical Engineering, Ajou University, Korea. His research interests include turbulence, turbulence modeling, flow control and computational fluid mechanics.

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Lee, J., Son, D. Proportional feedback control of laminar flow over a hemisphere. J Mech Sci Technol 30, 3667–3672 (2016). https://doi.org/10.1007/s12206-016-0728-y

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  • DOI: https://doi.org/10.1007/s12206-016-0728-y

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