Numerical Study of Response Performance of Vortex-Induced Vibration on a Rigid Cylinder Based on Finite Difference Method

doi:10.19596/j.cnki.1001-246x.7815

Abstract

Abstract: Numerical study based on a wake oscillator model is conducted to determine response performance of vortex-induced vibration (VIV) on a rigid cylinder. A coupled model of structural oscillator of a rigid cylinder and wake oscillator is established, and then the model is discretized and solved based on a standard central finite difference method of the second order. VIV response characteristics including dimensionless displacement, dimensionless lift, and frequency ratio and lock-in region varied with mass ratios and damping ratios are compared. It can be found that the numerical method simulates response performances of vortex-induced vibration on a rigid cylinder very well. As dimensionless mass ratio increases, onset of lock-in region occurs later, lock-out point occurs earlier, and so the lock-in region becomes smaller.

Key words: vortex-induced vibration, wake oscillator model, lock-in region, finite difference method

CLC Number:

O357

GAO Yun, ZOU Li, ZONG Zhi. Numerical Study of Response Performance of Vortex-Induced Vibration on a Rigid Cylinder Based on Finite Difference Method[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(1): 53-59.

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