Experimental study of freak wave impacts on a tension-leg platform |
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| Institution: | 1. Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China;3. Key Laboratory of Ships and Ocean Engineering of Fujian Province, Jimei University, Xiamen 361021, China;1. College of Civil Engineering, Shenzhen University, 3688 Nanhai Road, Nanshan District, Shenzhen, 518060, China;2. College of Engineering, Swansea University Bay Campus, Swansea, SA1 8EN, UK;3. School of Computing, Mathematics and Digital Technology, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK |
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| Abstract: | This study investigates the freak wave impinging on a tension-leg platform through wave flume experiments. The freak waves are generated using the focused wave theory. By adjusting the wave focusing location, different incident wave scenarios at the structure location are produced. Simultaneous measurements of wave shape evolutions upon impingement, wave impact pressures on the platform deck, platform motions and tether forces are carried out for synchronized analyses of the wave kinematics/dynamics and structural responses. The variation of these parameters with the incident wave profile is studied. It is found that although applying less intensive local impact pressures as compared to the highly-breaking freak wave, the slightly-breaking or non-breaking freak wave imposes the same level of adverse effect on the platform's global stability in terms of motions and tether forces. In addition, the high-crest freak wave causes violent motions of the floating platform, which are likely to induce snap loads of large amplitude and high occurrence frequency in tethers. The published results would provide useful benchmarks for validating numerical and analytical models. |
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| Keywords: | Freak wave Tension-leg platform Wave impact Platform motion Tether force |
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