Numerical Study on Dynamic Bifurcation of Vortex-induced Vibration of a Circular Cylinder with Flexible Splitter Plate
Based on the fluid-structure coupling module in the commercial software COMSOL Multiphysics,this paper takes the flow model of two-dimensional fixed cylindrical-flexible plate structure as the research object,and simulates its vortex vibration behavior at low Reynolds number.This paper mainly discusses the flow field characteristics of the flexible plate when the dynamic bifurcation occurs,as well as vibration characteristics of the flexible plate.The results show that the dynamic bifurcation behavior of flexible plates is related to the incoming Reynolds number.In the range of all calculated Reynolds numbers,two typical bifurcation behaviors of flexible plates are found(static and small amplitude vibration):Under the static dynamic bifurcation condition,the deflection angle of the plate increases with the increase of Reynolds number;under the dynamic bifurcation condition of small amplitude vibration,the vibration behavior of the plate develops from constant amplitude vibration to beat frequency vibration with the increase of Reynolds number;the dynamic bifurcation behavior of flexible plate is eliminated with further increase of Reynolds number.This study further confirms that the dynamic bifurcation behavior of a flexible plate depends on both the Reynolds number and the natural frequency of the plate.
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