Numerical simulation of the force and deformation of submerged plane nets in current

Based on the lumped mass method and Newton's second law, the numerical model of the force and movement response for fishing nets in current was set up, and then the dynamic deformation and the equilibrium configuration of the plane net in current along the positive direction of x-axis were studied by means of computer numerical simulation method. In this paper, under the conditions of two weight modes (GW1=4.12N, GW2=16.38N) and six current velocities (U=0.17, 0.22, 0.28, 0.33, 0.39 and 0.44 ms-1), the total drag force in the forward flow and the horizontal and vertical displacements of the net bottom were calculated after the plane net getting equilibrium in current. The calculated results showed that the influences of weight system and current velocity on the characteristics of drag force and deformation of plane net are significant. With the increase of flow velocity, the motion deformation of the plane net in current was intensified obviously. Moreover, when the weight increased, the deformation of the net decreased accordingly, and the enhancement of the total drag force accelerated apparently with the flow velocity increasing. Simulated results consisted well with other investigator's experimental data, which verified the accuracy and efficiency of the model.