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

机译：围网围网水弹性行为的数值和实验分析

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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 . 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.
机译：本文提出了一种通用的三维水弹性工具，用于分析不同类型的渔网和水产养殖设施。柔性网股由具有两个节点的非线性桁架单元建模。使用莫里森方程计算由于网与周围流体的相对运动引起的流体动力载荷。使用有限元（FE）近似法求解耦合的水动力-弹性动力方程。此外，还提供了用于围网的阻力的实验数据，围网通常在地中海用作捕鱼工具。测量是在NTUA的拖船上对网状样品进行的。该网以三种配置进行了测试：垂直，水平和45度倾斜。将得出的阻力系数与FEM开发模型的预测进行比较。从实验和理论上也研究了围网在平静水中的垂直淹没行为。此外，模拟了围网捕鱼的射击阶段，目的是研究网的潜水行为。相邻股线的流阴影效应被确定为潜水行为一致预测的关键参数。

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  • 来源
    《Ocean Engineering》 |2013年第15期|88-105|共18页
  • 作者

    V.A. Riziotis; G.M. Katsaounis; G. Papadakis; S.G. Voutsinas; G. Bergeles; G.D. Tzabiras;

  • 作者单位

    School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou street, CR15780 Athens, Greece;

    School of Naval Architecture and Marine Engineering, National Technical University of Athens, 9 Heroon Polytechneiou street, CRI5780 Athens, Greece;

    School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou street, CR15780 Athens, Greece;

    School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou street, CR15780 Athens, Greece;

    School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou street, CR15780 Athens, Greece;

    School of Naval Architecture and Marine Engineering, National Technical University of Athens, 9 Heroon Polytechneiou street, CRI5780 Athens, Greece;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    fishing nets; hydroelasticity; finite element; truss elements; hydrodynamic loading;

    机译：渔网;水弹性有限元;桁架元素流体动力载荷;

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