In order to study a prediction method for vortex-induced vibration (VIV) characteristics of a cylinder structure, the VIV model of a single-DOF elastically supported cylinder was established based on Van der Pol wake oscillator model firstly. Then, based on the computational fluid dynamics (CFD) method and the overset mesh technique, considering simultaneously incoming flow direction vibration and transverse one of the elastically supported cylinder, the hi-fi simulation model for VIV of the cylinder structure was established. The simulation results were compared with the test data published in abroad reference to verify the correctness of the two models. The simulation results showed that in cases of low mass ratio, the calculation error of Van der Pol wake oscillator model is very large in fields with a smaller reduction velocity, while this error is smaller in fields near the maximum amplitude of the cylinder to basically capture VIV characteristics of the cylinder, and Van der Pol wake oscillator model can be used to rapidly predict VIV characteristics of cylinder structures in engineering; within ranges of low mass ratio, high mass ratio and specified reduction speed, using CFD method and overset mesh technique can avoid mesh distortion and negative mesh problems caused by larger vibration amplitude of the cylinder, and obtain better calculation accuracy and detailed flow field information, but the calculation efficiency is lower than that of Van der Pol wake oscillator model.
Key words
cylinder structure /
vortex-induced vibration (VIV) /
Van der Pol wake oscillator model /
computational fluid dynamics (CFD) /
overset mesh
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