The increasing global need for renewable energy has rendered the development of offshore wind energy extremely significant. In areas where ocean depths exceed 50 meters, conventional permanent foundations become economically unfeasible, becoming floating offshore wind turbines (FOWTs) a superior alternative. Simultaneously, the development of marine resources in offshore areas has failed to meet increasing market demand, necessitating the urgent expansion of aquaculture fisheries into deeper waters. This research developed a fully integrated model of a cage platform, net system, and mooring system, compatible with the NREL 5MW wind turbine. Numerical simulation methods, based on potential flow theory and Morrison’s equation, are utilized to examine the motion response characteristics of the coupled system under various sea conditions. The study results demonstrate that the net, acting as a damping element, significantly decreased the system’s motion response and enhanced its stability. The system’s dynamic response is influenced by wave height and period in both regular and irregular wave circumstances, particularly under extreme sea conditions. Furthermore, the net’s presence minimally affects the wind turbine’s power output while contributing to the mitigation of power fluctuations. The examination of complex environmental circumstances influenced by wind, waves, and currents reveals that a rise in current velocity markedly changes the system’s surge motion trend, although it has little impact on power output. The work establishes a theoretical framework for the design and optimization of deep-sea wind-fishery integrated systems, providing insights into the maximization of marine resource utilization and the commercial deployment of wind energy.

Offshore floating photovoltaic (FPV) platforms have attracted attention as a promising approach for expanding solar energy utilization in marine environments. However, the hydrodynamic behavior of connected FPV arrays and the associated mooring response under realistic offshore conditions remain insufficiently understood. In this study, a numerical model of a connected offshore FPV platform array designed for the East China Sea is established using frequency-domain hydrodynamic analysis and time-domain simulations. The effects of module spacing and connector configuration are first examined for a twin-float system, and the optimized connection scheme is then applied to a 4 × 4 array. The motion responses, air-gap variation, and mooring performance of the array are evaluated under operational and extreme sea states. The results show that the surge response of the array is governed by an edge amplification effect under operational conditions, whereas the array tends to exhibit a more coordinated, quasi-rigid-body response as environmental loading increases. The heave response is influenced by wave shielding among adjacent units, while the pitch motion is strongly synchronized by the spring–damper connection system. The air-gap and mooring analyses indicate that the platform maintains sufficient freeboard and mooring safety margins under the considered sea states. These findings provide useful guidance for the preliminary design and safety assessment of connected offshore FPV arrays.

This paper develops a two-dimensional fully Lagrangian meshless fluid–structure interaction solver by integrating the Moving Particle Semi-implicit (MPS) method with continuum mechanics to investigate the nonlinear interaction between waves and floating bodies. The stability and accuracy of the proposed model are validated through several benchmark cases. Furthermore, the solver is employed to analyze the dynamic response of a flat plate floating body in waves. The numerically generated waves exhibit a minimum error of approximately −0.5% and a period consistent with theoretical values, maintaining a smooth and continuous free surface. Due to the inherent limitations of the two-dimensional wave-floating body simulation, the Root Mean Square Error (RMSE) of the interaction results ranges from 5.4% to 15.2%. These findings indicate that the proposed method provides a valuable reference for the design and analysis of floating structures in ocean engineering.