Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force

Huang, LePing; Choi, Kwing-So; Fan, BaoChun; Chen, YaoHui

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.

Citation

Huang, L., Choi, K.-S., Fan, B., & Chen, Y. (2014). Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force. Science China Physics, Mechanics and Astronomy, 57(11), https://doi.org/10.1007/s11433-014-5416-2

• Journal Article Type: Article
• Acceptance Date: Dec 23, 2013
• Online Publication Date: Apr 14, 2014
• Publication Date: Nov 30, 2014
• Deposit Date: Sep 21, 2017
• Publicly Available Date: Sep 21, 2017
• Journal: Science China Physics, Mechanics and Astronomy
• Print ISSN: 1674-7348
• Electronic ISSN: 1869-1927
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 57
• Issue: 11
• DOI: https://doi.org/10.1007/s11433-014-5416-2
• Keywords: Turbulence control, Direct numerical simulation, Channel flow, Lorentz force, Drag reduction
• Public URL: https://nottingham-repository.worktribe.com/output/739023
• Publisher URL: https://link.springer.com/article/10.1007/s11433-014-5416-2
• Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s11433-014-5416-2.
• Contract Date: Sep 21, 2017