Abstract
This article mainly concentrates on a large-volume drilling semi-submersible platform, aiming to reveal wave run-up characteristics along square columns and give the relationship between air gap distributions and wave parameters. The tests with fixed model were conducted firstly on its encountering a series of monochromatic waves. A wide range of wave slope (H/L) were selected to investigate the air gap response in detail. As can be seen, larger wave steepness will generally cause smaller air gap in the same wave period, which indicates nonlinear effects of incoming wave can amplify wave elevation. Model tests with mooring condition were also conducted in the same wave conditions. As was expected, the maximum relative wave elevation reduces obviously compared with the fixed one. However, wave shape close to columns show higher harmonic characteristics due to interaction between waves and the columns of semi-submersible platform. Meaningful conclusions from the model tests are drawn in this article, which is helpful in air gap design of floating offshore platform to a certain extent. In addition, the experimental results will provide an important reference for further research on validation and update of theoretical models of air gap.
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KAZEMI S., INCECIK A. Theoretical and experimental analysis of air gap response and wave-on-deck impact of floating offshore structures[C]. Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering. San Diego, California, USA, OMAE2007-29288, 2007, 297–304.
SWEETMAN B., WINTERSTEIN S. R. Air gap prediction: Use of second-order diffraction and multi-column models[C]. Proceedings of the Fourteenth International Offshore and Polar Engineering Conference. Stavanger, Norway, 2001, 390–397.
DANMEIER D. G., SEAH R. K. M. and FINNIGAN T. et al. Validation of wave run-up calculation methods for a gravity based structure[C]. 27th International Conference on Offshore Mechanics and Arctic Engineering. Estoril, Portugal, OMAE2008-57625, 2008, 265–274.
KRIEBEL D., WALLENDORF L. Air gap model tests on a MOB module[C]. Proceedings of the Fourteenth International Offshore and Polar Engineering Conference. Stavanger, Norway, 2001, 286–293.
SIMOS A. N., SPARANO J. V. and ARANHA J. A. P. et al. 2nd order hydrodynamic effects on resonant heave, pitch and roll motions of a large-volume semi-submer-sible platform[C]. Proceeding of the 27th International Conference on Offshore Mechanics and Artic Engineering. Estoril, Portugal, OMAE2008-57430, 2008, 229–237.
KAZEMI S., INCECIK A. Numerical prediction of air gap response of floating offshore structures using direct boundary element method[C]. Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering. Halkidiki, Greece, OMAE2005-67399, 2005, 803–809.
WANG Yan, YOU Yun-xiang. Numerical simulation of interaction of viscous wave fields with a semi-submersible platform[J]. Chinese Journal of Hydrodynamics, 2009, 24(6): 793–799(in Chinese).
DONG Zhi, ZHAN Jie-min. Numerical modeling of wave evolution and run-up in shallow water[J]. Journal of Hydrodynamics, 2009, 21(6): 731–738.
MATSUMTO F. T., WATAI R. A. and SIMOS A. N. Wave run-up and air gap prediction for a large-volume semi-submersible platform[C]. Proceedings of the 29th International Conference on Offshore Mechanics and Arctic Engineering. Shanghai, China, OMAE2010-20165, 2010, 151–159.
LWANOWSKI B., WEMMENHOVE R. CFD simulation of wave run-up on a semi-submersible and comparsion with experiment[C]. Proceedings of the 28th International Conference on Offshore Mechanics and Arctic Engineering. Honolulu, Hawaii, USA, OMAE2009-79052, 2009, 19–29.
NIELSEN F. G. Comparative study on air gap under floating platforms and run-up along platform columns[J]. Marine Structures, 2003, 16(2): 97–134.
LIN Chun-Yuan, HUANG Ching-Jer. Decomposition of incident and reflected higher harmonic waves using four wave gauges[J]. Coastal Engineering, 2004, 51(5–6): 395–406.
MAVRAKOS S. A., CHATJIGEORGIOU I. K. and RIGOROPOULOS G. Scale experiment of motions and wave run-up on a TLP model, subjected to monochro-matic waves[C]. Proceedings of the Fourteenth International Offshore and Polar Engineering Conference. Toulon, France, OMAE2004, 382–389.
MORRIS-THOMAS M. T., THIAGARAJAN K. P. The run-up on a cylinder in progressive surface gravity waves: Harmonic components[J]. Applied Ocean Research, 2004, 26(3–4): 98–113.
BOO S. Y. Measurements of higher harmonic wave forces on a vertical truncated circular cylinder[J]. Ocean Engineering, 2006, 33(2): 219–233.
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Project supported by the National Natural Science Foundation of China (Grant Nos. 50879045, 50709019).
Biography: SHAN Tie-bing (1982-), Male, Ph. D. Candidate
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Shan, Tb., Yang, Jm., Li, X. et al. Experimental Investigation on Wave Run-up Characteristics Along Columns and Air Gap Response of Semi-Submersible Platform. J Hydrodyn 23, 625–636 (2011). https://doi.org/10.1016/S1001-6058(10)60158-8
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DOI: https://doi.org/10.1016/S1001-6058(10)60158-8