Parametric Behavior of a Vortex-Induced Vibration Model of Cylinders With Two Degrees-of-Freedom Using a Wake Oscillator

Abstract

A recent model to predict vortex-induced vibrations of a rigid cylinder is analyzed, and its response is compared with different experimental data presented in the literature. One database with the tuning parameters for different mass ratios, damping ratios, Reynolds number, and Strouhal number is presented. This article provides a set of predefined tuning parameters for different experimental conditions. We presented the results of the cross-flow and in-line reduced amplitudes, the mean drag coefficient, the lift coefficient, and the cross-flow reduced frequency, all versus the reduced velocity. Also, an equation to estimate the cross-flow maximum reduced amplitude as function of the mass ratio was generated. The model shows to be efficient in predicting the maximum amplitude of vibration in the cross-flow direction when compared to experimental data for mass ratios varying from 2.36 to 12.96 and for damping ratios from 0.002 to 0.4, predicting the reduced amplitude in both directions. The simulation results when varying the Reynolds number and the Strouhal number are in good agreement with experimental data. Moreover, the model shows to be less sensitive to variations in the damping ratio when compared to variations in the mass ratio.