Investigations on the Effects of Vortex-Induced Vibration with Different Distributions of Lorentz Forces
Source abstract
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.
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Research context
OpenAlex topics: Fluid Dynamics and Vibration Analysis · Wind and Air Flow Studies · Vibration and Dynamic Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China
Funding
the National Natural Science Foundation of China · A Foundation for the Author of National Excellent Doctoral Dissertation of PR China · the Fundamental Research Funds for the Central Universities
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