Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

doi:10.1088/1674-1056/22/10/104701

Abstract In this paper, the electro–magnetic control of a cylinder wake in shear flow is investigated numerically. The effects of the shear rate and Lorentz force on the cylinder wake, the distribution of hydrodynamic force, and the drag/lift phase diagram are discussed in detail. It is revealed that Lorentz force can be classified into the field Lorentz force and the wall Lorentz force and they affect the drag and lift forces independently. The drag/lift phase diagram with a shape of “8” consists of two closed curves, which correspond to the halves of the shedding cycle dominated by the upper and lower vortices respectively. The free stream shear (K > 0) induces the diagram to move downward and leftward, so that the average lift force directs toward the downside. With the upper Lorentz force, the diagram moves downwards and to the right by the field Lorentz force, thus resulting in the drag increase and the lift reduction, whereas it moves upward and to the left by the wall Lorentz force, leading to the drag reduction and the lift increase. Finally the diagram is dominated by the wall Lorentz force, thus moving upward and leftward. Therefore the upper Lorentz force, which enhances the lift force, can be used to overcome the lift loss due to the free stream shear, which is also obtained in the experiment.

Keywords: cylinder wake control Lorentz force shear flow hydrodynamic force

Received: 06 December 2012
Revised: 05 March 2013
Accepted manuscript online:

PACS:	47.15.Cb	(Laminar boundary layers)
	47.85.L-	(Flow control)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11202102 and 11172140) and the Specialized Research Fund for Doctoral Program of High Education, China (Grant No. 20123219120050).

Corresponding Authors: Zhang Hui
E-mail: zhanghui1902@hotmail.com

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Zhang Hui (张辉), Fan Bao-Chun (范宝春), Chen Zhi-Hua (陈志华), Chen Shuai (陈帅), Li Hong-Zhi (李鸿志) Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement 2013 Chin. Phys. B 22 104701

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Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

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