The flow around a body of revolution with an appendage controlled by electromagnetic force is calculated by a finite volume method in order to assess the influence of the appendage on the flow and the control effect of the electromagnetic force. The Reynolds number (Re) base on the hull length is 1.0 Â 10 7 . An electromagnetic actuator is flushmounted on the surface of the appendage to generate streamwise eletromagnetic force (Lorentz force) for flow control. The flow around the body at straight course and 6 yaw controlled by Lorentz force is simulated and discussed. The results indicate that the elliptical appendage introduces a complex wake structure and force fluctuation. The wake of the appendage has less influence on the boundary layer of the body at 6 yaw than at straight course. When the Reynolds number is as high as 1.0 Â 10 7 , the flow field and dynamic characteristic of the body approximate to the Euler solution. The Lorentz force may suppress the near-wall separation from the appendage effectively and reduce the drag and vibration, especially in the straight course case.
The electromagnetic hydrodynamics(EMHD) propulsion by surface is performed through the reaction of electromagnetic body force, which is induced in conductive flow fluid (such as seawater, plasma and so on) around the propulsion unit. Based on the basic governing equations of electromagnetic field and hydrodynamics, by numerical simulations obtained by the finite volume method, the characteristics of flow field structures near the navigating and the strength variation of propulsion force are investigated at varying positions (the angle of attack). The results show that surface electromagnetic body force can modify the structure and the input energy of flow boundary layer, which enables the navigation to obtain the thrust. With the increase of interaction parameter the effect of viscous resistance and pressure drag to navigating decrease and the nonlinear relationship between propulsion coefficient and interaction parameter tends to be linear gradually. The strength of propulsion force depends mainly on the electromagnetic body force. The lift force can be improved effectively through the EMHD propulsion by surface at an angle of attack for navigating. The navigating surface can be designed as working space of propulsion units, which is of certain significance for optimizing the whole struction and improving the efficiency.
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