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Citation:
　Bruno Thierry Nyatchouba Nsangue,Tang Hao,Tcham Leopold,et al.Hydrodynamic Behavior of a Trawl Codend and its Fluttering Motions in Flume Tank[J].Journal of Marine Science and Application,2025,(2):345-369.[doi:10.1007/s11804-025-00666-9]
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Hydrodynamic Behavior of a Trawl Codend and its Fluttering Motions in Flume Tank

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Title:
Hydrodynamic Behavior of a Trawl Codend and its Fluttering Motions in Flume Tank
Author(s):
Bruno Thierry Nyatchouba Nsangue1; 2; 3; 4;  Tang Hao1; 2; 3; 4;  Tcham Leopold5;  Ruben Mouangue5;  Jian Zhang1; 2; 3; 4;  Wei Liu6;  Achille Njomoue Pandong5; 7;  Liuxiong Xu1; 2; 3; 4;  Fuxiang Hu1; 2; 3; 4
Affilations:
Author(s):
Bruno Thierry Nyatchouba Nsangue1; 2; 3; 4;  Tang Hao1; 2; 3; 4;  Tcham Leopold5;  Ruben Mouangue5;  Jian Zhang1; 2; 3; 4;  Wei Liu6;  Achille Njomoue Pandong5; 7;  Liuxiong Xu1; 2; 3; 4;  Fuxiang Hu1; 2; 3; 4
1. College of Marine Living Resource Sciences and Management, Shanghai Ocean University, Shanghai, 201306, P. R. China;
2. National Engineering Research Center for Oceanic Fisheries, Shanghai, 201306, P. R. China;
3. Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai, 201306, China;
4. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Shanghai Ocean University, Ministry of Education, Shanghai, 201306, China;
5. Laboratory E3M, National High Polytechnic School of Douala, University of Douala, Douala, 2701, Cameroon;
6. East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200090, China;
7. The National Advanced School of Maritime and Ocean Science and Technology (NASMOST) of the University of Ebolowa, Ebolowa, 118, Cameroon
Keywords:
Trawl codend; Hydrodynamic characteristics; Proper orthogonal decomposition; Fluttering motions; Unsteady turbulent flow
分类号:
-
DOI:
10.1007/s11804-025-00666-9
Abstract:
This study experimentally investigates the hydrodynamic characteristics, geometric configurations, fluttering motions of the codend, and the instantaneous flow fields inside and around the codend, with and without a liner, under varying catch sizes and inflow velocities. A proper orthogonal decomposition method is employed to extract phase-averaged mean properties of unsteady turbulent flows from flow measurement data obtained using an electromagnetic current velocity meter inside and around the codend. The results reveal that as catch size increases, the drag force, codend motion, Reynolds number, and codend volume increase while the drag coefficient decreases. Owing to the codend shape and pronounced motion, a complex fluid-structure interaction occurs, demonstrating a strong correlation between drag force and codend volume. The oscillation amplitudes of the hydrodynamic forces and codend motions increase with increasing catch size, and their oscillations mainly involve low-frequency activity. A significant reduction in the flow field occurs inside and around the unlined codend without a catch. The flow field is 5.81%, 14.39%, and 27.01% lower than the unlined codend with a catch, the codend with a liner but without a catch, and the codend with both a liner and a catch, respectively. Fourier analysis reveals that the codend motions and hydrodynamic forces are mainly characterized by low-frequency activity and are synchronized with the unsteady turbulent flow street. Furthermore, the proper orthogonal decomposition results reveal the development of unsteady turbulent flow inside and around the codend, driven by flow passage blockage caused by the presence of the liner, intense codend motions, and the catch. Understanding the hydrodynamic characteristics and flow instabilities inside and around the codend, particularly those associated with its fluttering motions, is crucial for optimizing trawl design and improving trawl selectivity.

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Memo

Memo:
Received date:2024-3-29;Accepted date:2024-7-12。
Foundation item:This study was financially sponsored bythe National Natural Science Foundation of China (Grant No. 32373187), the Research Fund for International Scientists of the National Natural Science Foundation of China (Grant No. 32350410404), and the Natural Science Foundation of Shanghai (Grant No. 23ZR1427000).
Corresponding author:Tang Hao,E-mail:htang@shou.edu.cn
Last Update: 2025-04-23