An Examination of Wake Oscillator Models for Vortex-Induced Vibrations

Abstract : Experimental results for vortex-induced vibrations of both pivoted and non-pivoted cylinders in a crossflow are presented in this report. Simplified models involving two ordinary differential equations are reviewed and shown to exhibit many of the features of the experimental results. Results of perturbation analysis of the simplified model are presented and used to explain some qualitative features, such as resonant frequency locking and hysteresis, in terms of bifurcations in the slow flow.