Numerical investigation of the hydrodynamic behaviors of multiple net cages in waves |
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| Affiliation: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Ocean and Civil Engineering, Dalian Ocean University, Dalian 116023, China;3. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Naval Architecture Engineering, Dalian University of Technology, Dalian 116024, China;3. Environmental Science and Technology College, Dalian Maritime University, Dalian 116026, China;1. Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, Guangzhou 510300, China;2. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China;3. Offshore Oil Engineering Company Limited, Tianjin 300452, China;1. Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, NO-7491, Norway;2. Centre for Autonomous Marine Operations and Systems (AMOS), NTNU, Trondheim, NO-7491, Norway;3. CNR-INSEAN, Marine Technology Research Institute, Rome, Italy;4. Sintef Ocean, Trondheim, Norway |
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| Abstract: | Large fish farms that include multiple-cages are becoming common in the aquaculture industry. Selecting an appropriate mooring structure and arrangement of cages is necessary to avoid fish cage and mooring grid system failures. A numerical model based on the lumped mass method and the principle of rigid body kinematics is developed to predict the hydrodynamic response of a fish cage and mooring grid system to regular waves. To validate the numerical model, a series of experiments is conducted. The numerical results of this model correspond with those obtained from experimental observations. Then, two cage arrangements are investigated, and the effect of the wave direction is analyzed. The results show that when the wave incident angle is 0°, the maximum tension forces on the anchor lines of the two cage arrangements are close to each other. There is not a significant difference between the effective fish cage volumes of the two cage arrangements. However, if one anchor line is broken, the two cage arrangements have different degrees of risk of having the cage structures swept away. When the propagation direction of the incident wave changes, the tension forces on the anchor lines also change due to different transfer load paths. |
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