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Chin. Phys. B, 2017, Vol. 26(8): 084704    DOI: 10.1088/1674-1056/26/8/084704

Mechanism of controlling turbulent channel flow with the effect of spanwise Lorentz force distribution

Yang Han(韩洋), Hui Zhang(张辉), Bao-Chun Fan(范宝春), Jian Li(李健), Dai-Wen Jiang(江代文), Zi-Jie Zhao(赵子杰)
Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China

A direct numerical simulation (DNS) is performed to investigate the control effect and mechanism of turbulent channel flow with the distribution of spanwise Lorentz force. A sinusoidal distribution of constant spanwise Lorentz force is selected, of which the control effects, such as flow characters, mean Reynolds stress, and drag reductions, at different parameters of amplitude A and wave number kx are discussed. The results indicate that the control effects vary with the parameter A and kx. With the increase of A, the drag reduction rate Dr first increases and then decreases rapidly at low kx, and slowly at high kx. The low drag reduction (or even drag increase) is due to a weak suppression or even the enhancements of the random velocity fluctuation and mean Reynolds stress. The efficient drag reduction is due to the quasi-streamwise vortex structure induced by Lorentz force, which contributes to suppressing the random velocity fluctuation and mean Reynolds stress, and the negative vorticity improves the distribution of streamwise velocity. Therefore, the optimal control effect with a drag reduction of up to 58% can be obtained.

Keywords:  flow control      turbulent channel flow      Lorentz force      direct numerical simulation  
Received:  24 March 2017      Revised:  13 April 2017      Accepted manuscript online: 
PACS:  47.85.L- (Flow control) (Drag reduction)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 11672135 and 11202102), the Fundamental Research Funds for the Central Universities, China (Grant No. 30916011347), and a Foundation for the Author of National Excellent Doctoral Dissertation, China (Grant No. 201461).

Corresponding Authors:  Hui Zhang     E-mail:
About author:  0.1088/1674-1056/26/8/

Cite this article: 

Yang Han(韩洋), Hui Zhang(张辉), Bao-Chun Fan(范宝春), Jian Li(李健), Dai-Wen Jiang(江代文), Zi-Jie Zhao(赵子杰) Mechanism of controlling turbulent channel flow with the effect of spanwise Lorentz force distribution 2017 Chin. Phys. B 26 084704

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