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Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force

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Abstract

Turbulent control and drag reduction in a channel flow via a bidirectional traveling wave induced by spanwise oscillating Lorentz force have been investigated in the paper. The results based on the direct numerical simulation (DNS) indicate that the bidirectional wavy Lorentz force with appropriate control parameters can result in a regular decline of near-wall streaks and vortex structures with respect to the flow direction, leading to the effective suppression of turbulence generation and significant reduction in skin-friction drag. In addition, experiments are carried out in a water tunnel via electro-magnetic (EM) actuators designed to produce the bidirectional traveling wave excitation as described in calculations. As a result, the actual substantial drag reduction is realized successfully in these experiments.

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Authors and Affiliations

  1. Xi’an Aerospace Propulsion Institute, Xi’an, 710100, China

    LePing Huang

  2. Science and Technology on Transient Physics Laboratory, Nanjing University of Science & Technology, Nanjing, 210094, China

    LePing Huang, BaoChun Fan & YaoHui Chen

  3. Faculty of Engineering, University of Nottingham, Nottingham, NG72RD, UK

    KwingSo Choi

Authors
  1. LePing Huang
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  2. KwingSo Choi
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  3. BaoChun Fan
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  4. YaoHui Chen
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Correspondence to KwingSo Choi.

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Huang, L., Choi, K., Fan, B. et al. Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force. Sci. China Phys. Mech. Astron. 57, 2133–2140 (2014). https://doi.org/10.1007/s11433-014-5416-2

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  • DOI: https://doi.org/10.1007/s11433-014-5416-2

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