Research on VIV prediction model and influence factors of deep-water risers

doi:10.16265/j.cnki.issn1003-3033.2019.07.002

Abstract

Abstract: This research is carried out in order to improve the effectiveness of predicting the VIV of deep-water risers under the collective action of multiple factors. Firstly, based on Euler-Bernoulli beam bending theory and improved Van Der Pol wake oscillator equation, the VIV predication model of marine risers was established considering the effects of internal fluid flow and cross-flow (CF) and coupled in-line (IL), a differential equation was derived by using hermit interpolation function, and Newmark-β method was used to solve the displacement of risers in time domain through iterative solution. Then a VIV experiment was conducted to verify the prediction model. Finally, the effects of sea current flow velocity, internal and external flow velocity and top tension on VIV characteristics of deep-water risers were discussed. The results show that the vibration frequency and amplitude of a riser will increase as the sea current velocity increases, the natural frequency of risers may be reduced to the range of lock frequency along with the increase of internal flow velocity, accelerating the fatigue failure of risers, and influence of internal flow is obviously suppressed by the top tension, the two-way coupling effect should be given sufficient attention in the vibration analysis of risers.

Key words: deep-water risers, vortex-induced vibration (VIV), internal fluid flowing, Euler-Bernoulli beam bending theory, wake oscillator

CLC Number:

X944.4

LUO Zhengshan, CAI Mengqian. Research on VIV prediction model and influence factors of deep-water risers[J]. China Safety Science Journal, 2019, 29(7): 6-11.

References

[1] 骆正山,袁宏伟.基于误差补偿的GM-RBF海底管道腐蚀预测模型[J].中国安全科学学报,2018,28(3): 96-101.
LUO Zhengshan,YUAN Hongwei. GM-RBF model based error compensation for prediction od submarine pipeline corrosion[J]. China Safety Science Journal, 2018,28(3): 96-101.
[2] THORSEN M J,SAVIK S,LARSEN C M. Time domainsimulation of vortex-induced vibrations in stationary andoscillating flows[J]. Journal of Fluids and Structures,2016,61: 1-19.
[3] 唐友刚,青兆熹,张杰,等.深海立管涡激振动预报模型及影响因素[J].哈尔滨工程大学学报,2017,38(3): 338-343.
TANG Yougang,QING Zhaoxi,ZHANG Jie,et al.Prediction model and influence factors on vortex-induced vibration of deepwater risers[J]. Journal of Harbin Engineering University, 2017,38(3): 338-343.
[4] 高云,谭暖,熊友明,等.基于改进尾流振子模型的柔性圆柱体涡激振动响应特性数值研究[J].振动与冲击,2017,36(22):86-92,171.
GAO Yun,TAN Nuan,XIONG Youming,et al. Numerical study of response performance of vortex-induced vibration on a flexible cylinder using a modified wake oscillator model[J]. Journal of Vibration and Shock,2017,36(22):86-92,171.
[5] 袁昱超,薛鸿祥,唐文勇.振荡流下柔性立管涡激振动时域响应研究[J].振动与冲击,2018, 37 (13):56-64,91.
YUAN Yuchao,XUE Hongxiang,TANG Wenyong. Vortex-induced vibration time domain respones of flexible risers under oscillatory flows[J]. Journal of Vibration and Shock,2018, 37 (13):56-64,91.
[6] 翟云贺,康庄,宋儒鑫,等.不同固有频率比条件下圆柱双自由度涡激振动特性的数值研究[J].海洋工程, 2018, 36 (4): 50-59.
ZHAI Yunhe,KANG Zhuang,SONG Ruxin,et al.Numerical simulation of two-degree of freedom vortex-induced vibration of circular cylinder with variable natural frequency ratio[J]. Ocean Engineering, 2018, 36 (4): 50-59.
[7] NGUYEN V T, NGUYEN H H. Detached eddy simulations of flow induced vibrations of circular cylinders at high Reynolds numbers [J]. Journal of Fluids Structures, 2016, 63: 103-119.
[8] 郭芳,刘屿,赵志甲,等.耦合内流动力学的海洋柔性立管振动控制[J].振动与冲击, 2017,36(21): 157-162.
GUO Fang,LIU Yu,ZHAO Zhijia,et al. Vibration control of a flexible marine riser coupled with the internal fluid dynamics[J].Journal of Vibration and Shock, 2017,36(21): 157-162.
[9] XU Wanhai, GAO Xifeng, DU Jie. The prediction of in-line vortex-induced vibration for slender marine structures[J]. Acta Mechanica Sinica, 2012, 28(5): 1 303-1 308.
[10] 郭海燕,牛建杰,李效民,等.海洋立管涡激振动模型的实验验证[J].中国海洋大学学报: 自然科学版, 2015, 45 (6): 108-115.
GUO Haiyan,NIU Jianjie,LI Xiaomin,et al.Comparions of numerical and experimental study on vortex-induced vibration of marine riser under stepped current[J]. Periodical of Ocean University of China: Natural Science Edition, 2015, 45 (6): 108-115.
[11] DNV-OS-F201-2001,Det norske veritas, offshore standard-dynamic risers[S].
[12] 余承龙. 内波场中海洋立管动力响应研究[D].青岛:中国石油大学(华东),2014.
YU Chenglong. Dynamic response of marine riser transporting fluid in internal waves field[D]. Qingdao:China University of Petroleum(East China),2014.
[13] FACCHINETTI M L, EMMANUEL D L,BIOLLEY F.Coupling of structure and wake oscillators in vortex-induced vibrations[J].Journal of Fluids and Structures,2004,19(2):123-140.
[14] 王亚非. 双自由度圆柱体的涡激振动研究[D].哈尔滨:哈尔滨工程大学,2016.
WANG Yafei. Study on two degrees of freedom vortex-induced vibration of circular cylinder[D]. Harbin:Harbin Engineering University,2016.
[15] 李非凡. 考虑内流的细长柔性立管涡激振动数值模拟研究[D].天津:天津大学,2014.
LI Feifan. Numerical investigation on the vortex-induced vibration of a flexible slender riser with internal flow[D]. Tianjin: Tianjin University,2014.