科研之友
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摘要
Carrying out mooring system hydrodynamic research is of great significance to the long-term use of large deep-sea gravity cages under severe sea conditions. Firstly the concentrated mass method was used to construct a simplified mechanical model of the gravity cage mooring system, then a numerical model of the cage was established based on the marine engineering hydrodynamic analysis software OrcaFlex. And the reliability of the numerical simulation results under regular wave conditions was verified by the physical model test in the tank. Furthermore, a numerical study of the hydrodynamics under extreme sea conditions was carried out for the gravity cage mooring system in Qinzhou Bay at a depth of 20 m. The extreme sea conditions adopted extreme wave conditions with the return period of one hundred years. Taking into account the symmetry of the mooring cage system, the difference in the tension of the mooring lines under the wave direction angles of 0° and 45° was analyzed. The results show that when the wave direction is parallel to the central axis of the mooring system, the rope tension amplitude is smaller and the force is more uniform. The research results can provide a certain reference for the scientific layout of the same type of the gravity cage mooring system, and a preliminary research basis for the large-scale operation of large deep-sea gravity cages.
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