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A Finite Element Study of Multi-Mode VIV of Slender Riser Experiencing Non-Uniform Flow

[+] Author Affiliations
Min Li

Beijing University of Aeronautics and Astronautics, Beijing, China

Weimin Chen, Liwu Zhang

Chinese Academy of Sciences, Beijing, China

Paper No. OMAE2011-49296, pp. 215-221; 7 pages
doi:10.1115/OMAE2011-49296
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 7: CFD and VIV; Offshore Geotechnics
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4439-7
  • Copyright © 2011 by ASME

abstract

The dynamic characteristics of deepwater riser usually present serried modes with lower frequencies, because structural flexibility is very large due to high aspect ratio (ratio of length to diameter of riser). Moreover, in practice flow velocity usually distributes non-uniformly along the riser length. A coupling model, for multi-mode VIV (vortex-induced vibration) of slender riser experiencing non-uniform flow, by means of finite element simulation combined with the hydrodynamic model taking account of the interaction between fluid and structure in time-domain, is proposed. VIV responses of slender risers respectively in uniform, stepped and shear flow are explored. Satisfied agreements with experiment results are observed. Additionally, based on the numerical simulations effects of reduced velocity and modal energy on modal weight are explored. We note that for case of multi-mode vibration the participating modes tend to distribute by groups.

Copyright © 2011 by ASME

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