The underlying mechanisms of the electromagnetic control of cylinder wake are investigated and discussed.The effects of Lorentz force are found to be composed of two parts,one is its direct action on the cylinder(the wall Lorentz force)and the other is applied to the fluid(called the field Lorentz force)near the cylinder surface.Our results show that the wall Lorentz force can generate thrust and reduce the drag;the field Lorentz force increases the drag.However,the cylinder drag is dominated by the wall Lorentz force.In addition,the field Lorentz force above the upper surface decreases the lift,while the upper wall Lorentz force increases it.The total lift is dominated by the upper wall Lorentz force.
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