Phase-averaged mean properties of turbulent flow developing, around a fluttering sheet of net
Phase-averaged mean properties of turbulent flow developing, around a fluttering sheet of net
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DOI：
10.1016/j.oceaneng.2014.03.009
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发表时间：
2014-05-15
影响因子：
5
通讯作者：
Germain, Gregory
中科院分区：
文献类型：
--
作者：
Bouhoubeiny, Elkhadim;Druault, Philippe;Germain, Gregory
时间分辨粒子图像测速（PIV）测量进行调查的水动力流与一个有代表性的一块渔网结构的相互作用。利用基于正交分解的后处理数学工具，从Ply数据库中提取了湍流的相平均特性，证明了网格周围存在湍流边界层（TBL）流动。计算结果还表明，结构振动对网格开度以及通过结构的湍流有很大的影响。这项工作使我们能够证明，渔具的阻力计算，通常基于均匀速度，不仅需要考虑当地的速度赤字附近的水平部分的网，但也瞬时振荡的网片。(C)2014爱思唯尔有限公司版权所有。
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 Ply 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. (C) 2014 Elsevier Ltd. All rights reserved.