Abstract:As a kind of economical and hydrodynamic net material, the knotless nylon net is widely used in Marine aquaculture cage fishing nets. Considering the working conditions of the net, especially under the action of water flow, the deformation characteristics of the net and the changes in the surrounding flow field are key. Based on the shear stress SST K-ω turbulence model and combined with combined with the one-way fluid-structure coupling method of ANSYS Workbench, the pressure value of the net is applied as an input load on the surface of the net plane. The flow field characteristics of the planar nylon knotless net under different flow rates, different solidity and angles of attack are studied,and the finite element model of large-deformation nonlinear net structure is analyzed. The results show that the one-way coupling numerical simulation based on FSI is feasible for the analysis of net plane deformation and flow field characteristics. At different angles of attack, the flow rate reduction through the net is different. The hydrodynamic coefficient of the net is obtained under different flow rate, solidity and angles of attack. The characteristics of equivalent stress distribution and deformation variation with the angles of attack are also be represented.