By Daniel Priour
This publication absolutely describes a finite point technique for netting. That describes the relation among forces and deformation of the netting. That takes under consideration forces because of the wire elasticity, the hydrodynamic forces, the trap impact, the mesh establishing stiffness. This booklet is split in five elements. the 1st part comprises advent at the finite point technique, the second one half is ready equilibrium calculation, the 3rd provides a triangular point for netting, the fourth and 5th are for cable and node aspect. The 6th offers few validation cases.
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Additional info for A Finite Element Method for Netting: Application to fish cages and fishing gear
This point is the main foundation of the model. 2) 12 (13): vector from vertex 1 (1) to vertex 2 (3). 2 The Finite Element for Netting 31 (a) (b) Fig. 4 The diamond mesh (a) is decomposed into triangular elements (b). 6) 32 4 The Triangular Finite Element for Netting 2 1 3 4 (a) 2 1 3 4 (b) Fig. 5 Case identical to Fig. 3. Although the netting in panel 1 has only 45 meshes horizontally, the triangular element discretization is easy. The step size of panel 2 is larger in (a) than in (b) Fig. 6 A triangular element: the sides of the triangle are linear combinations of twine vectors (U and V).
These facilities are not well described in the literature dedicated to this method. 2 The Finite Element for Netting Triangular elements have been developed to model the net (Fig. 4). A number of approximations are made in these triangular elements, with the aim of calculating the forces at the vertices of these elements. These are calculated based on the positions Fig. 2 The Finite Element for Netting 29 2 1 2 3 4 3 (a) 1 4 (b) Fig. 2 Structure of four panels of 50 by 50 meshes (a) discretized in numerical twines (b; globalization ratio of 10): the connection between numerical nodes on the borders of panels is perfect (black dots for the border between panels) of the vertices.
This triangular element for netting is fully described. The forces required for the equilibrium calculation are fully described, as well as the stiffness in case of—twines elasticity,—hydrodynamic forces,—twine flexion,—mesh opening stiffness,—fish catch pressure,—inertia,—buoyancy and weight. 1 Constitutive Law for Nets There is little or no published work on the constitutive law for nets. Only Rivlin , to our knowledge, begins to express the stresses in a net surface, but only under conditions of symmetrical deformation twine.