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

Type Article
Date 2014-05
Language English
Author(s) Bouhoubeiny Elkhadim1, 2, Druault Philippe2, 3, Germain GregoryORCID1
Affiliation(s) 1 : IFREMER, Marine Struct Lab, F-62321 Boulogne Sur Mer, France.
2 : Univ Paris 06, UMR 7190, Inst Jean Le Rond dAlembert, F-75252 Paris 5, France.
3 : CNRS, UMR 7190, Inst Jean Le Rond dAlembert, F-75252 Paris 5, France.
Source Ocean Engineering (0029-8018) (Pergamon-elsevier Science Ltd), 2014-05 , Vol. 82 , P. 160-168
DOI 10.1016/j.oceaneng.2014.03.009
WOS© Times Cited 8
Keyword(s) Fishing net structure, Hydrodynamics, PIV, Turbulent boundary layer flow
Abstract 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.
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