Numerical modeling of wave run-up along columns of semi-submersible platforms

Document Type: marine engineering

Authors

Department of Marine Industries, Faculty of Marine Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

Wave run-up is one of the most important and effective parameters in designing semi-submersible platforms. Besides unforeseen effects on the movements and response of the platform, wave run up can also cause slamming forces to be exerted on the lower deck of the platform. Therefore, at the first stages of this plan, before running tests on the model of the platform, numerical methods are usually utilized for estimating the appropriate height of semi-submersible platforms’ deck in order to prevent any damage on it In this paper, in order to verify the validity of simulation and also the efficiency of "Flow3D" on predicting the wave run-up and also the effect of wave impact under various steepness on a semi-submersible platform, results derived from the simulation by "Flow3D" compared to the results of both WAMIT tool and the experimental model. The results show that "Flow3D" has great capability to estimate the amount of wave run-up when investigating the waves with the steepness of up to about 4 percent. But, by increasing the steepness of striking wave in front of the aft columns, the results obtained from the software are not in good agreement with the experimental and WAMIT results.
 

Keywords


Bogdan Iwanowski, Marc Lefranc, and Rik Wemmenhove, "CFD simulation of wave run-up on a semi-submersible and comparison with experiment," in Proceedings of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering, Honolulu, Hawaii, USA, 2009.

Fabio T Matsumoto, Rafael A Watai, and Alexandre N Simos, "Wave run-up and air gap prediction for a large-volume semi-submersible platform," Journal of Offshore Mechanics and Arctic Engineering, 2013.

Hamidreza Babaali, Abolfazl Shamsai, and Hamidreza Vosoughifar, "Computational modeling of the hydraulic jump in the stilling," Arab J Sci Eng, p. 4, october 2014.

Leen DeVos, Peter Frigaard, and Julien DeRouck, "Wave run-up on cylindrical and cone shaped foundations for offshore wind turbines," Coastal Engineering, pp. 17-29, 2007.

Tie-bing SHAN, Jian-min YANG, LI Xin, and XIAO Long-fei, "Experimental investigation on wave run-up characteristics along columns and air gap response of semi-submersible platform," Journal of Hydrodynamics, pp. 625-636, 2011.

Yan WANG and Yun-xiang YOU, "Numerical simulation of interaction of viscous wave fields with a semi-submersible platform," Chinese Journal of Hydrodynamics, pp. 793-799, 2009.