Numerical and experimental analysis of the hydroelastic behavior of purse seine nets

OCEAN ENGINEERING

卷:58

Article

Riziotis, V. A.¹  Katsaounis, G. M.²  Papadakis, G.¹  Voutsinas, S. G.¹  Bergeles, G.¹  Tzabiras, G. D.² 

[1] Natl Tech Univ Athens, Sch Mech Engn, GR-15780 Athens, Greece

[2] Natl Tech Univ Athens, Sch Naval Architecture & Marine Engn, GR-15780 Athens, Greece

关键词: Fishing nets;    Hydroelasticity;    Finite element;    Truss elements;    Hydrodynamic loading;   

DOI  :  10.1016/j.oceaneng.2012.09.022

来源: Elsevier

【 摘 要 】

The paper presents a general three dimensional hydro-elastic tool for the analysis of different types of fishing nets and aquaculture facilities. Flexible net strands are modeled by non-linear truss elements having two nodes. Hydrodynamic loads due to relative motion of the net with the surrounding fluid are computed using the Morison equation. The coupled hydrodynamic-elastodynamic equations are solved using finite element (FE) approximations. Furthermore, experimental data are presented for the drag resistance of a purse seine net, commonly used as fishing tool in the Mediterranean sea. The measurements were conducted in the towing tank of NTUA on a sample of a net. The net was tested in three configurations: vertical, horizontal and inclined at 45 degrees The derived drag coefficients are compared to predictions of the FEM developed model. The vertical submergence behavior of the seine in calm water is also examined, both experimentally and theoretically. Moreover, the shooting phase of the purse-seine fishing is simulated with the aim to investigate the diving behavior of the net. The flow shading effect of neighboring strands is identified as a critical parameter for the consistent predictions of the diving behavior. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

Free