Predictions of VIV-mathematical models for a rectangular 4:1 cylinder

Results of aeroelastic tests on a rectangular 4:1 cylinder are compared with semi-empirical model predictions to show the inadequacy of existing models in estimating vortex-induced vibrations of bluff bodies. After estimating the input model parameters at a certain Scruton number, their predictions of the peak values of the limit-cycle oscillation amplitude at higher Scruton numbers are compared with the experimental responses. The variation of the aeroelastic parameters with the Scruton number of a van der Pol-type model clearly shows its inadequacy in predicting lock-in oscillations. Other models’ predictions will be analyzed in the full-length paper.