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Publications
Pascoal, R., Guedes Soares, C., Facon, G., Pétrié, F. and Vaché, M. (2004), “Hydrodynamic Analysis and Motions of the Octoplus Platform”, Proceedings of the 23rd International Conference on Offshore Mechanics and Arctic Engineering (OMAE´04), 20-25 June, 2004, Vancouver, Canada, ASME, New York, Paper OMAE2004-51574
The hydrodynamic behavior of a new concept for FPSO is studied. The OCTOPLUS, standing for Optimum Concept TO Produce and Load with Underwater Storage, possesses a simple yet special geometry, consisting of surface piercing parallelepipedic columns and underwater storage caisson. It is designed for float over deck installation of the two main decks, the production and the utility deck. 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, 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 pressures, 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.
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