0
research-article

HYDRODYNAMICS OF FLEXIBLE PIPE WITH STAGGERED BUOYANCY ELEMENTS UNDERGOING VORTEX-INDUCED VIBRATIONS

[+] Author and Article Information
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
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
shixiao.fu@sjtu.edu.cn

Leijian Song

Marine Design & Research Institute of China, Shanghai 200011, China
songleijian@163.com

Jie Wu

SINTEF Ocean, Trondheim, 7052, Norway
jie.wu@marintek.sintef.no

Halvor Lie

SINTEF Ocean, Trondheim, 7052, Norway
halvor.lie@marintek.sintef.no

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
hanwen_hu@126.com

1Corresponding author.

ASME doi:10.1115/1.4040509 History: Received May 18, 2017; Revised June 05, 2018

Abstract

Flexible pipe with staggered buoyancy elements such as lazy wave riser, drilling riser etc., 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 cross flow 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.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In