Flexible pipe with staggered buoyancy elements such as lazy wave riser and drilling riser has been widely used in ocean engineering. Under the influence of sea current, both of the buoyancy elements and the riser may experience vortex induced vibrations (VIV). However, when VIV occurs, hydrodynamic characteristics of the buoyancy elements and its influence on hydrodynamic force of the bare pipe still need investigation. The purpose of this paper is to reveal the hydrodynamic characteristics of flexible pipe with staggered buoyancy elements undergoing VIV. The crossflow (CF) hydrodynamic coefficients of the flexible pipe with 25%, 50%, and 100% coverage of staggered buoyancy are obtained from model tests, using hydrodynamic forces and coefficients identification method. Then, the characteristics of added mass coefficients and excitation coefficients in CF direction are analyzed. The results show that the added-mass coefficients of bare pipe are relatively larger than those of buoyancy module, while the total mass per unit length (sum of structural mass and added mass) is consistent along the pipe. Similarly, the range of excitation coefficient on the buoyancy elements is smaller than that on the bare pipe, and their ratio is equal to the reciprocal of diameter ratio 2.5.
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December 2018
Research-Article
Hydrodynamics of Flexible Pipe With Staggered Buoyancy Elements Undergoing Vortex-Induced Vibrations
Mengmeng Zhang,
Mengmeng Zhang
State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: 15145029174@163.com
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: 15145029174@163.com
Search for other works by this author on:
Shixiao Fu,
Shixiao Fu
State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: shixiao.fu@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: shixiao.fu@sjtu.edu.cn
Search for other works by this author on:
Hanwen Hu
Hanwen Hu
State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: hanwen_hu@126.com
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: hanwen_hu@126.com
Search for other works by this author on:
Mengmeng Zhang
State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: 15145029174@163.com
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: 15145029174@163.com
Shixiao Fu
State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: shixiao.fu@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: shixiao.fu@sjtu.edu.cn
Leijian Song
Jie Wu
Halvor Lie
Hanwen Hu
State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: hanwen_hu@126.com
Shanghai Jiao Tong University,
Shanghai 200240, China;
Collaborative Innovation Centre for Advanced
Ship and Deep-Sea Exploration,
Shanghai 200240, China
e-mail: hanwen_hu@126.com
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 18, 2017; final manuscript received June 5, 2018; published online July 24, 2018. Assoc. Editor: Ioannis K. Chatjigeorgiou.
J. Offshore Mech. Arct. Eng. Dec 2018, 140(6): 061805 (17 pages)
Published Online: July 24, 2018
Article history
Received:
May 18, 2017
Revised:
June 5, 2018
Citation
Zhang, M., Fu, S., Song, L., Wu, J., Lie, H., and Hu, H. (July 24, 2018). "Hydrodynamics of Flexible Pipe With Staggered Buoyancy Elements Undergoing Vortex-Induced Vibrations." ASME. J. Offshore Mech. Arct. Eng. December 2018; 140(6): 061805. https://doi.org/10.1115/1.4040509
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