A Power Equation Model for Vortex-Induced Vibration of Circular Cylinder

Based on a semi-empirical model of vortex-induced vibration of an elastically mounted circular cylinder, the general equation of dynamics is put forward to establish the power equation for free vortex-induced vibration in this paper. The derivation of the governing equation is the general method to analyze fluid-structure interaction without priori assumptions about the form of the governing equations, which is of good/strong applicability and expansibility. To estimate the reliability of power equation in free vibrations, the power equation acquiring flow field provided by CFD is solved and compared with the experimental results. Results show that the power equation is effective to predict the response of structure in vortex induced vibration.