Hydrodynamic characteristics of semi-submersible fish farm under the action of Waves and currents

• 1、College of Ocean and Civil Engineering, Dalian Ocean University, Dalian, Liaoning, 116023
• 2、 Key Laboratory of Environment Controlled Aquaculture (Dalian Ocean University), Ministry of Education, Dalian, Liaoning, 116023

Abstract：In this paper, based on the potential flow theory, the numerical model for hydrodynamic characteristics analysis of semi-submersible fishing farm under the combined action of waves and currents is established by using the boundary element method, Morrison equation and mesh group method respectively for the large-scale structure, small-scale component and mesh structure of the deep-sea fish farm. By using parametric analysis method, the motion response and mooring line tension of fishing fish farm are compared and analyzed under different wave and current combinations and different fish farm scale parameters. The results show that under the action of pure regular waves, the greater the draft of the fish farm, the smaller the amplitude of its motion response and the peak tension of the mooring line, and the change of the draft has a greater impact on the tension, surge and pitch of the mooring line of the fish farm, but has a smaller impact on the heave motion; Under the combined action of wave and current, when the wave and current are in the same direction, the greater the velocity is, the smaller the motion response amplitude in all directions of the platform is; When the wave current is reversed, the larger the velocity is, the larger the amplitude in the heave and surge directions of the platform is, and the smaller the pitch amplitude is; Compared with wave current in the same direction, the motion response amplitude of the fish farm is larger when the wave current is reversed, and the peak tension of the mooring line is smaller.

Keywords： Port Coastal and Offshore Engineering semi-submerged fish farm Wave-current action