Numerical study of response performance of vortex-induced vibration on a flexible cylinder using modified wake oscillator model

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (22) : 86-92.

GAO Yun1, 2, TAN Nuan1, XIONG You-ming1, ZOU Li3, ZONG Zhi3

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Abstract

Numerical study has been conducted for the response performance of VIV of a flexible cylinder based on modified wake oscillator model. The structure oscillator model of a flexible cylinder and wake oscillator model are established, and then the two models are coupled. Parameters analyses of non-dimensional displacement, phase angle, frequency ratio and displacement fluctuation characteristics are executed by changing non-dimensional tension, aspect ratio and mass ratio. The analysis results indicate that the VIV response of a flexible cylinder has an obvious travelling wave behavior. The propagation speed increases as non-dimensional tension increases and aspect ratio decreases, respectively. The phase angle has a sudden transition with increased non-dimensional tension and aspect ratio. The sudden transition appears at the point when the vibrating frequency passes the natural frequency.

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Flexible cylinder / wake oscillator model / numerical study / travelling wave / phase angle

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GAO Yun1, 2, TAN Nuan1, XIONG You-ming1, ZOU Li3, ZONG Zhi3. Numerical study of response performance of vortex-induced vibration on a flexible cylinder using modified wake oscillator model[J]. Journal of Vibration and Shock, 2017, 36(22): 86-92

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