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Phase-averaged mean properties of turbulent flow developing around a fluttering sheet of net

机译:围绕网状颤动片形成的湍流的相平均平均特性

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摘要

Time-Resolved Particle Image Velocimetry (PIV) measurements are performed to investigate the hydrodynamic flow interaction with a representative piece of fishing net structure. Using the advanced post-processing mathematical tool based on Proper Orthogonal Decomposition, the phase averaged mean properties of turbulent flows are extracted from PIV database, demonstrating the existence of a Turbulent Boundary Layer (TBL) flow developing all around the sheet of net. The results also show that the mesh opening and so the turbulent flow passing through the structure are strongly influenced by the structure oscillations. This work allows us to demonstrate that the drag computation of fishing gear, commonly based on uniform velocity, needs to consider not only the local velocity deficit near the horizontal part of the net but also the instantaneous oscillations of the sheet of net.
机译:进行时间分辨粒子图像测速(PIV)测量以研究与代表性渔网结构之间的流体动力流动相互作用。使用基于适当正交分解的高级后处理数学工具,从PIV数据库中提取了湍流的相位平均均值特性,证明了围绕整个网格扩展了湍流边界层(TBL)流的存在。结果还表明,网孔的打开以及通过结构的湍流都受到结构振动的强烈影响。这项工作使我们证明,通常基于匀速的渔具阻力计算不仅需要考虑网水平部分附近的局部速度赤字,而且还需要考虑网片的瞬时振动。

著录项

  • 来源
    《Ocean Engineering》 |2014年第15期|160-168|共9页
  • 作者单位

    FREMER, Marine Structures Laboratory, 150 Quai Gambetta, 62321 Boulogne-sur-Mer, France,Universite Pierre et Marie Curie-Paris 6, UMR 7190, Institutjean Le Rond d'Alembert, 75252 Paris cedex 5, France;

    Universite Pierre et Marie Curie-Paris 6, UMR 7190, Institutjean Le Rond d'Alembert, 75252 Paris cedex 5, France,CNRS, UMR 7190, Institut Jean Le Rond d'Alembert, 75252 Paris cedex 5, France;

    FREMER, Marine Structures Laboratory, 150 Quai Gambetta, 62321 Boulogne-sur-Mer, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fishing net structure; Hydrodynamics; PIV; Turbulent boundary layer flow;

    机译:渔网结构;流体力学PIV;湍流边界层流;

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