Numerical simulation of vortex induced vibration considering rotational-DOF

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 185-189.

KANG Zhuang，NI Wenchi

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Abstract

At present, the vortex induced vibration (VIV) studies are mainly focused on circular cylinders fixed elastically with one DOF or 2-DOF to analyze change laws of their amplitude, frequency and phase etc. vibration responses with variation of the reduced velocity. For the VIV considering rotational-DOF, the relevant studies are not many due to the restriction of test devices and detection methods. Here, based on the software OpenFoam, the VIV response features of circular cylinders with a lower mass ratio and rotational-DOF were simulated numerically. Firstly, according to Williamson (2004)’s test, the VIV response of a cylinder with two-DOF was simulated, then a rotational-DOF was added and the similar numerical simulation for this cylinder under the same boundary conditions was conducted. Through the contrastive analysis of these two VIV responses, it was concluded that the cylinder’s yaw phenomenon occurs in its VIV process; at the same time, the yaw phenomenon slightly suppresses the VIV amplitude; in addition, the yaw frequency is equal to the cylinder’s lateral vibration frequency, and the yaw amplitude is related to the form of tail vortex.

Key words

vortex induced vibration (VIV) / rotational DOFs / numerical simulation / yaw

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KANG Zhuang，NI Wenchi. Numerical simulation of vortex induced vibration considering rotational-DOF[J]. Journal of Vibration and Shock, 2018, 37(9): 185-189

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