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Numerical Analysis of Pontoon Effect on Flow-Induced Forces of the Deep Draft Semisubmersible in a Cross-Flow

[+] Author Affiliations
Mingyue Liu, Longfei Xiao, Haining Lyu

Shanghai Jiao Tong University, Shanghai, China

Longbin Tao

Newcastle University, Newcastle upon Tyne, UK

Paper No. OMAE2015-41764, pp. V001T01A030; 7 pages
doi:10.1115/OMAE2015-41764
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Geotechnics
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5647-5
  • Copyright © 2015 by ASME

abstract

Deep draft semisubmersible (DDS) concepts have been developed recently in order to improve the vertical motion characteristics of the platform, due to the smaller wave exciting forces on the pontoons than a conventional semisubmersible. However, the DDS may experience critical vortex-induced motions (VIM) stemming from the fluctuating forces in a strong current environment. Aiming to investigate the excitation loads and the mechanism of VIM, Computational Fluid Dynamics (CFD) analyses are performed to study the flow around the DDS in a cross-flow. Special attentions are paid to the effect of the pontoon and the heading angle. Good agreement between CFD simulations and model test results for the current loads of a DDS is observed. Detailed computational results including hydrodynamic loads and flow patterns are presented.

Copyright © 2015 by ASME

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