Numerical simulation of the effects of fish behavior on flow dynamics around net cage |
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| Institution: | 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. Tokyo University of Marine Science and Technology, 4-5-7 Konan Minato-ku, Tokyo, 108-8477, Japan;2. Research and Development Department, Nichimo Co., Ltd, Shimonoseki, Yamaguchi, 750-1136, Japan;1. Institute of Naval Architecture and Ocean Engineering, Universidad Austral de Chile, General Lagos 2086, Campus Miraflores, Valdivia, Chile;2. Ocean Engineering Program, Department of Civil Engineering, Texas A&M University, CVLB 3136 TAMU, College Station, TX 77843-3136, USA;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Environmental Sciences and Technology College, Dalian Maritime University, Dalian 116026, China |
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| Abstract: | The computational fluid dynamics study is performed to analyze the impact of the cultured fish on the flow field through net cage and the deformation of net cage. The shear stress turbulent k-omega model is applied to simulate the flow field through the net cage, and the large deformation nonlinear structure model is adopted to conduct the structural analysis of the flexible net cage. To validate the net-fluid interaction model of the net cage in current, a series of physical model tests are conducted, which indicate that the numerical model can accurately simulate the flow field around the net cage and the deformation of the net cage. A fish model is used to simulate the effect of fish behavior on the flow pattern around the net cage and the deformation of the net cage. In addition, the flow fields around the net cage in current are investigated considering different fish group structures, fish swimming speeds, fish distributions and fish stocking densities. The results indicate that the circular movement of fish in the still water leads to a low pressure zone at the center of net cage, which causes a strong vertical flow along the center line of the net cage. The drag force on the net cage is significantly decreased with the increasing fish stocking density, but the most severe deformation of net cage occurred in the case of medium fish stocking density. |
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| Keywords: | Fish stocking density Net deformation SST k-omega model Finite element method |
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