This research activity represents the logical continuation of the work documented in [1] and [2] on water on deck and parametric roll for an FPSO in regular waves. Here the same numerical method, based on a domain-decomposition strategy, is used to examine the platform with bilge keels, both without and with mooring-line system. It is found that bilge keels with length 40% of the ship length and with breadth the 3% of the ship breadth limit effectively the roll when instability is promoted by vertical bow motions in waves. In these conditions also the amount of the shipped water is substantially reduced. Large roll induced by the coupling with the lateral motions seems to be less well counteracted and remains close to 10° for steepness kA ≥ 0.2. This value is often set as maximum allowed amplitude for FPSOs in normal operational conditions. Also the effect on the shipped water is limited in this case. Increasing the bilge-keels breadth is confirmed to be beneficial but the combination of the mooring system with dynamic positioning appears needed for a proper control of the roll motion in the worst examined cases.
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ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
May 31–June 5, 2015
St. John’s, Newfoundland, Canada
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5659-8
PROCEEDINGS PAPER
Numerical Study of Bilge-Keel Effect on Parametric Roll and Water on Deck for an FPSO
Marilena Greco,
Marilena Greco
NTNU, Trondheim, Norway
CNR-INSEAN, Rome, Italy
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Claudio Lugni,
Claudio Lugni
CNR-INSEAN, Rome, Italy
NTNU, Trondheim, Norway
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Giuseppina Colicchio,
Giuseppina Colicchio
CNR-INSEAN, Rome, Italy
NTNU, Trondheim, Norway
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Odd M. Faltinsen
Odd M. Faltinsen
NTNU, Trondheim, Norway
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Marilena Greco
NTNU, Trondheim, Norway
CNR-INSEAN, Rome, Italy
Claudio Lugni
CNR-INSEAN, Rome, Italy
NTNU, Trondheim, Norway
Giuseppina Colicchio
CNR-INSEAN, Rome, Italy
NTNU, Trondheim, Norway
Odd M. Faltinsen
NTNU, Trondheim, Norway
Paper No:
OMAE2015-41961, V011T12A050; 10 pages
Published Online:
October 21, 2015
Citation
Greco, M, Lugni, C, Colicchio, G, & Faltinsen, OM. "Numerical Study of Bilge-Keel Effect on Parametric Roll and Water on Deck for an FPSO." Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. Volume 11: Prof. Robert F. Beck Honoring Symposium on Marine Hydrodynamics. St. John’s, Newfoundland, Canada. May 31–June 5, 2015. V011T12A050. ASME. https://doi.org/10.1115/OMAE2015-41961
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