Model test verification of floater systems in ultra-deep water meets limitations when it comes to available laboratory sizes. Systems in depths beyond 1000–1500 m cannot be tested at reasonable scales without the truncation of the mooring and riser system. The development of methods and procedures to overcome this problem has been addressed through extensive research programs at MARINTEK (VERIDEEP, VERIDEEP Extension, NDP, DEMO2000). This led to a hybrid verification procedure which combines reasonable truncation principles, model tests of the truncated system, and numerical simulations, to estimate the system’s response at full depth. There is, however, still a need to address the actual influence from the truncation procedure, and from the integration with simulations, on the final extrapolated full depth results. This paper presents a case study for the validation of the procedure, that compares full depth model test results of a semisubmersible in water depth 1250m against the extrapolated full depth results obtained from a truncated system of 500m. Results are presented for line tension and vessel responses in 3 seastates. In general the extrapolated full depth results were found to be in good agreement with the full depth model tests. However, the results confirmed expectation that the low frequency response has the greater uncertainties and presents the greatest challenge for the procedure.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4821-0
PROCEEDINGS PAPER
Ultra-Deepwater Model Testing of a Semisubmersible and Hybrid Verification
Timothy E. Kendon,
Timothy E. Kendon
MARINTEK, Trondheim, Norway
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Rolf J. Baarholm,
Rolf J. Baarholm
MARINTEK, Trondheim, Norway
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Svein I. Karlsen,
Svein I. Karlsen
MARINTEK, Trondheim, Norway
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Carl-Trygve Stansberg,
Carl-Trygve Stansberg
MARINTEK, Trondheim, Norway
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Ronaldo R. Rossi,
Ronaldo R. Rossi
CENPES, Rio de Janeiro, RJ, Brazil
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Rodrigo A. Barreira,
Rodrigo A. Barreira
CENPES, Rio de Janeiro, RJ, Brazil
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Vinicius L. F. Matos,
Vinicius L. F. Matos
CENPES, Rio de Janeiro, RJ, Brazil
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Joel S. Sales, Jr.
Joel S. Sales, Jr.
LabOceano, Rio de Janeiro, RJ, Brazil
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Timothy E. Kendon
MARINTEK, Trondheim, Norway
Ola Oritsland
MARINTEK, Trondheim, Norway
Rolf J. Baarholm
MARINTEK, Trondheim, Norway
Svein I. Karlsen
MARINTEK, Trondheim, Norway
Carl-Trygve Stansberg
MARINTEK, Trondheim, Norway
Ronaldo R. Rossi
CENPES, Rio de Janeiro, RJ, Brazil
Rodrigo A. Barreira
CENPES, Rio de Janeiro, RJ, Brazil
Vinicius L. F. Matos
CENPES, Rio de Janeiro, RJ, Brazil
Joel S. Sales, Jr.
LabOceano, Rio de Janeiro, RJ, Brazil
Paper No:
OMAE2008-57400, pp. 277-290; 14 pages
Published Online:
July 27, 2009
Citation
Kendon, TE, Oritsland, O, Baarholm, RJ, Karlsen, SI, Stansberg, C, Rossi, RR, Barreira, RA, Matos, VLF, & Sales, JS, Jr. "Ultra-Deepwater Model Testing of a Semisubmersible and Hybrid Verification." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 4: Ocean Engineering; Offshore Renewable Energy. Estoril, Portugal. June 15–20, 2008. pp. 277-290. ASME. https://doi.org/10.1115/OMAE2008-57400
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