Semi-submersible Offshore Coupled Motion in Irregular Waves

Authors

  • Baoji Zhang College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306，China.
  • Ying Wang College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306，China.

DOI:

https://doi.org/10.30564/jms.v2i2.1923

Abstract

In order to predict the hydrodynamic performance of semi-submersible offshore platform accurately, based on CFD theory, continuous equation and N-S equation as the control equation, RNG type k-ε model as turbulence model, using the finite difference method to discretize the control equation，using the Semi-Implicit Method for Pressure Linked Equation (SIMPLE) algorithm to solve the control equation，using the VOF method to capture the free surface. The numerical wave tank of irregular wave is established, and the wave force and motion response of the semi-submersible platform under irregular wave are studied. Based on the Jonswap spectrum density function, for a certain area of two irregular waves (South China sea, a-ten-year return period, a-hundred-year return period) sea condition, five wave direction Angle (0 °, 30 °, 45 °, 60 °, 90 °), a total of 10 kinds of conditions of the motion response of semi-submersible platform are simulated, through analysis and comparison of simulation results, the influence law of wave angle, wave period and wave height on platform motion is obtained. Compared with the experimental values, the results of heave and pitch are close to the experimental data under the sea condition of 2, 0 degree wave angles. The research results in this paper can provide reference for the design and motion response prediction of practical semi-submersible offshore platforms.

Keywords:

Semi-submersible offshore platform, CFD method, Irregular waves, Motion response, Wave force

References

[1] Sarkar A and Taylor R E. Low-frequency responses of nonlinearly moored vessels in random waves: coupled surge pitch and heave motions[J]. Journal of Fluids and Structures, 2001,15:133-150.

[2] Aidan Bharath , Jean-Roch Nader, Irene Penesis, Gregor Macfarlane. Nonlinear hydrodynamic effects on a generic spherical wave energy converter[J]. Renewable Energy,2018, 118.

[3] Tan J H C, Magee A, Kim J M, et al. CFD simulation for vortex induced motions of a multi-column floating platform [C]. Proceedings of the 32nd International Conference on Ocean, Offshore and Arctic Engineering. Nantes: OMAE, 2013: 11-17

[4] Thanh-ToanTran, Dong-Hyun Kim. The platform pitching motion of floating offshore wind turbine: A preliminary unsteady aerodynamic analysis[J]. Journal of Wind Engineering & Industrial Aerodynamics,2015,142.

[5] Luca Oggiano, Fabio Pierella, Tor Anders Nygaard, Emile Arens. Comparison of Experiments and CFD Simulations of a Braceless Concrete Semi-submersible Platform[J]. Energy Procedia, Volume 94, September 2016, 278-289

[6] Wang Jun-Rong, Xie Bin．Review of Hydrodynamic performance and Global Motion Prediction of Semi- submersibles[J].Shipbuilding of China，2009,50(Special):255-260.

[7] Chen Mao-Qiao. Study on climbing and near-field interference effect of deep-sea semi-submersible platform [D].Jiangsu: Jiangsu University of Science and Technology,2016.

[8] Liu Yuan-Chuan. Numeical analysis of interaction of floating structures and mooring systems[D]. Shanghai: Shanghai Jiao Tong University,2014.

[9] Guo Wei,Zhou Nian-fu,Wang Shu-qi,Zhao Qiao-sheng. Hydrodynamic and energy analysis of wave energy converter with nonlinear PTO [J]. Journal Huazhong University of Science and Technology (Natural Science Edition), 2018,46(4):57-62.

[10] Xu Wang, Ji-Fu Zhou, Zhan Wang, Yun-Xiang You.A numerical and experimental study of internal solitary wave loads on semi-submersible platforms[J].Ocean Engineering, 2018, 150( 15) :298-308

[11] Bai Zhi-Ning,Xiao Long-Fei,Cheng Zheng-Shun, et al,. Experimental study on Vortex Induced Motion response of a Deep Draft Semi-submersible platform [J].Journal of Ship Mechanics, 2014,18(4):377-384.

[12] Wang Feng-Qin. Study on calculation of floating resistance of ship longitudinal assembly based on CFD method [J]. Ship Science and Technology. 2017 (22) ：1-3.

[13] Lin P, Liu P L F. A numerical study of breaking waves in the surf zone[J]. Journal of fluid mechanics，1998,24(3):239-264.

[14] Masoudian M，Pinho FT，Kim K，et al. A RANS model for heat transfer reduction in viscoelastic turbulent flow[J]. International Journal of Heat & Mass Transfer. 2016,100:332-346.

[15] Sheng-long Zhang,Bao-ji Zhang,Tahsin TezdoganLe-ping Xu,Yu-yang Lai . Computational fluid dynamics based hull form optimization using approximation method, Engineering Applications of Computational Fluid Mechanics,2017,12(3): 1-8.

[16] Hirt C W, Nichols B D. Volume of fluid (VOF) method for the dynamics of free boundaries[J]. Journal of computational physics. 1981, 39(1): 201-225.

[17] Sheng-long Zhang,Bao-ji Zhang,Tahsin TezdoganLe-ping Xu,Yu-yang Lai .Research on bulbous bow optimization based on the improved PSO algorithm, China Ocean Engineering, 2017,(33)4: 487- 494.

[18] Qi Peng, Wang Yong-Xue . 3-D numerical-wave-tank technology and its application [J]. Journal of Dalian University of Technology, 2003, 43(6): 825-830.

[19] Choi, Junwoo and Sung, Bum Yoon. Numerical simulations using momentum source wave-maker applied to RANS equation model[J].Coastal Engineering,2009, 56(10):

[20] -1060.

[21] Longo, J. and Stern, F.. Uncertainty Assessment for Towing Tank Tests With Example for Surface Combatant DTMB Model 5415 [J]. Journal of Ship research. 2005,49(1): 55-68.

[22] Zhang Bao Ji, Niu Lei .Study on Calculation Method of Added Resistance of Ships in Irregular Waves[J]. Naval Engineers Journal,2017,129(4):123-134.

[23] Longuet-Higgins M S. On an approximation to the limiting Stokes wave in deep water[J].Wave Motion, 2008,45(6):770-775.

[24] .Peter Bradshaw and George P. Huang .The Law of the Wall in Turbulent Flow . Proceedings: Mathematical and Physical Sciences 1995; Osborne Reynolds Centenary Volume 451(1941):165-188

[25] Chen Ze-Hua. Hydrodynamic performance analysis of semi-submersible platforms in extreme sea conditions [J]. China's water transport, 2018,18(1):16-18.

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Vol. 2 , Iss. 2 (July 2020)

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