Study on hydrodynamic performance of a set-net in current based on numerical simulation and physical model test

Abstract

The hydrodynamic performance of a large scale set-net in current was studied by means of numerical simulations based on finite element method and physical model test based on Tauti's law. The equilibrium configuration and the tension distribution of the set-net was calculated, and a series of physical model tests were conducted at flume tank. The results showed the tension of the main mooring line was greater than other cables and was about 70 kN at the current velocity of 1 kn. With the increasing current velocity, the float rope of the set-net was sinking, and the sink rope was floating upward. When the current velocity was less than 0.7 kn, the set-net can operate well accounting for the opened normally shape of its mesh. The simulated results of the set-net hydrodynamic performance were very close to the experimental results from the model test. This study could reveal the tension of mooring line and the deformation of the set-net for the design and application of the fishing gear in the future.