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《Journal of Ship Mechanics》 2013-04
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A numerical method to investigate non-linear wave run-up effects around semi-submersible in steep waves

SHAN Tie-bing, YANG Jian-min, LI Xin, XIAO Long-fei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)  
The effect of wave non-linear run-up along columns in steep waves was a hot topic, and also an important aspect in air-gap prediction of semi-submersible. In this paper, 3D numerical wave tank is created based on N-S equations and continuity equations, in which regular wave is generated based on flap wavemaker similar in physical deepwater offshore basin. Model tests are conducted to testify this numerical method and obtain the optimal mesh strategy. Wave diffraction and run-up effects are simulated in this numerical wave tank. Hexahedral meshes are created in all fluid regions based on multi-block coupling technology in order to increase iteration speed and accuracy of the solution, also capture free surface much smoothly. Results indicate that distributions of water surface around semi-submersible can be obtained in detail through this method. Moreover, the areas of strong non-linear wave around platform can also be predicted, which is also a key basis to determine installation locations before model tests. Wave surface is similar with model test which indicates further that this numerical method is feasible primarily in run-up sim- ulation. In addition, the process of wave diffraction and run-up along columns is also simulated from physical phenomenon, which will provide an important reference for further research on the non-linear interaction between wave and offshore structures.
【Fund】: 国家自然科学基金青年基金(50709019);国家自然科学基金资助项目(50879045);; 工业和信息化部高技术船舶科研项目“深海半潜式钻井平台工程开发”
【CateGory Index】: TV139.2
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