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Hydrodynamic Analysis and Motions of the Octoplus Platform

[+] Author Affiliations
R. Pascoal, C. Guedes Soares

Technical University of Lisbon, Lisboa, Portugal

G. Facon

Oceanide, La Seyne sur Mer, France

F. Pétrié, M. Vaché

Doris Engineering, Paris, France

Paper No. OMAE2004-51574, pp. 1061-1070; 10 pages
  • ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
  • 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B
  • Vancouver, British Columbia, Canada, June 20–25, 2004
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3743-2 | eISBN: 0-7918-3738-6
  • Copyright © 2004 by ASME


The hydrodynamic behavior of the OCTOPLUS, a new concept of FPSO is studied. The OCTOPLUS, stands for Optimum Concept TO Produce and Load with Underwater Storage and consists of surface piercing parallelepipedic columns and underwater storage caisson. It is designed for float over deck installation of its two main decks: production and utility deck. This enables fabrication of the decks to proceed in parallel with fabrication of the hull and therefore provides improvements in the construction schedule. The hydrodynamics are studied by physical testing and through numerical computations using a 3D radiation-diffraction code, comparison between both is provided. The experimental program encompasses 1, 10 and 100 year return period seas and the 6 DOF motions are measured. In addition to the comparison of motion transfer function modulus further calculations were performed in order to determine local pressure, having been found that there is a hydrodynamic effect peculiar to the interactions between waves scattered by the columns that is of some importance in design. The structure is shown to have exceptionally good hydrodynamic behavior in the sense that wave induced motions are small. Both the experimental and numerical results are in good agreement.

Copyright © 2004 by ASME
Topics: Motion



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