| Civil & Mechanical Engineering |
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| Hydrodynamic coefficients of a simplified floating system of gravity cage in waves |
| Chang-wen WU, Fu-kun GUI, Yu-cheng LI, Wei-huan FANG |
| Marine Science School, Zhejiang Ocean University, Zhoushan 316000, China; State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; College of Animal Sciences, Zhejiang University, Hangzhou 310058, China |
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Abstract Numerical simulation and experimental tests were carried out to examine the hydrodynamic behaviors of a double-column floating system of gravity cage under wave conditions. A floating system of gravity cage can be treated as a small-sized floating structure when compared with the wavelengths. The main problem in calculating the wave loads on the small-sized floating structure is to obtain the reasonable force coefficients, which may differ from a submerged structure. In this paper, the floating system of gravity cage is simplified to a 2D problem, where the floating system is set symmetrically under wave conditions. The motion equations were deduced under wave conditions and a specific method was proposed to resolve the problem of wave forces acting on a small-sized floating system of gravity cage at water surface. Results of the numerical method were compared with those from model tests and the hydrodynamic coefficients Cn and C were studied. It is found that Cn ranges from 0.6 to 1.0 while C is between 0.4 and 0.6 in this study. The results are useful for research on the hydrodynamic behavior of the deep-water gravity sea cages.
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Received: 26 September 2007
Published: 15 April 2008
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