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Appl. Sci. 2017, 7(1), 61; doi:10.3390/app7010061

Investigations on the Effects of Vortex-Induced Vibration with Different Distributions of Lorentz Forces

Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China
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Academic Editor: Gangbing Song
Received: 31 October 2016 / Revised: 2 December 2016 / Accepted: 3 January 2017 / Published: 7 January 2017

Abstract

The control of vortex-induced vibration (VIV) in shear flow with different distributions of Lorentz force is numerically investigated based on the stream function–vorticity equations in the exponential-polar coordinates exerted on moving cylinder for Re = 150. The cylinder motion equation coupled with the fluid, including the mathematical expressions of the lift force coefficient C l , is derived. The initial and boundary conditions as well as the hydrodynamic forces on the surface of cylinder are also formulated. The Lorentz force applied to suppress the VIV has no relationship with the flow field, and involves two categories, i.e., the field Lorentz force and the wall Lorentz force. With the application of symmetrical Lorentz forces, the symmetric field Lorentz force can amplify the drag, suppress the flow separation, decrease the lift fluctuation, and then suppress the VIV while the wall Lorentz force decreases the drag only. With the application of asymmetrical Lorentz forces, besides the above-mentioned effects, the field Lorentz force can increase additional lift induced by shear flow, whereas the wall Lorentz force can counteract the additional lift, which is dominated on the total effect. View Full-Text
Keywords: flow control; vortex-induced vibration; electro-magnetic control; hydrodynamic force flow control; vortex-induced vibration; electro-magnetic control; hydrodynamic force
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Zhang, H.; Liu, M.-K.; Fan, B.-C.; Chen, Z.-H.; Li, J.; Gui, M.-Y. Investigations on the Effects of Vortex-Induced Vibration with Different Distributions of Lorentz Forces. Appl. Sci. 2017, 7, 61.

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