Hydrodynamic analysis of a rotatable horizontal aquaculture cage platform under wind-wave-current multi-field coupling

To improve the stability of the deep-sea aquaculture cages, a numerical hydrodynamic model of a Rotatable Horizontal Aquaculture Cage Platform (RHACP) was developed based on three-dimensional potential flow theory and the Morison model. After verifying the reliability of the numerical simulation, this study focuses on analyzing the hydrodynamic characteristics, including heave, pitch, and surge, as well as the mooring forces of the RHACP at 3 different draft depths (9, 13, and 17 m). The results show that an increase in draft reduces the mooring line tension and the platform motion response. The heave and pitch responses of the RHACP are positively correlated with both wave height and wave period, whereas the surge response is positively correlated with wave height but negatively correlated with wave period. At an incident wave angle of 90°, the RHACP exhibits greater resistance to extreme sea states than that at 0°.