Based on improving the wake-oscillator model, an analytical model for vortex-induced vibration (VIV) of flexible riser under non-uniform current is presented, in which the variation of added mass at lock-in and the nonlinear relationship between amplitude of response and reduced velocity are considered. By means of empirical formula combining iteration computation, the improved analytical model can be conveniently programmed into computer code with simpler and faster computation process than CFD so as to be suitable to application of practical engineering. This model is validated by comparing with experimental result and numerical simulation. Our results show that the improved model can predict VIV response and lock-in region more accurately. At last, illustrative examples are given in which the amplitude of response of flexible riser experiencing VIV under action of non-uniform current is calculated and effects of riser tension and flow distribution along span of riser are explored. It is demonstrated that with the variation of tension and flow distribution, lock-in region of mode behaves in different way, and thus the final response is a synthesis of response of locked modes.
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ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
May 31–June 5, 2009
Honolulu, Hawaii, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4345-1
PROCEEDINGS PAPER
Prediction of Vortex-Induced Vibration of Flexible Riser Using an Improved Wake-Oscillator Model Available to Purchase
Wein-min Chen,
Wein-min Chen
Chinese Academy of Sciences, Beijing, China
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Liwu Zhang,
Liwu Zhang
Chinese Academy of Sciences, Beijing, China
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Min Li
Min Li
Beijing University of Aeronautics and Astronautics, Beijing, China
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Wein-min Chen
Chinese Academy of Sciences, Beijing, China
Liwu Zhang
Chinese Academy of Sciences, Beijing, China
Min Li
Beijing University of Aeronautics and Astronautics, Beijing, China
Paper No:
OMAE2009-79336, pp. 377-383; 7 pages
Published Online:
February 16, 2010
Citation
Chen, W, Zhang, L, & Li, M. "Prediction of Vortex-Induced Vibration of Flexible Riser Using an Improved Wake-Oscillator Model." Proceedings of the ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. Volume 5: Polar and Arctic Sciences and Technology; CFD and VIV. Honolulu, Hawaii, USA. May 31–June 5, 2009. pp. 377-383. ASME. https://doi.org/10.1115/OMAE2009-79336
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