Analysis of the hydrodynamic characteristics of chain-link woven copper alloy nets for fish cages

Jin, Bong; Kim, Ho; BAE, Jae Hyun; Yang, Yong Su; Kim, Dae Hyun

doi:10.1016/j.aquaeng.2013.05.002

Cited by 38 publications

(16 citation statements)

References 22 publications

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“…For the similar solidity ratio, netting panels with larger mesh size will have larger areas of undisturbed flow, resulting in lower force on netting panels, such as net-1 with mesh size of 52.87 mm and net-3 with mesh size of 46.97 mm. Many researchers have applied Computational Fluid Dynamic (CFD) or Particle Image Velocimetry (PIV) along with experiments to investigate the flow characteristics through and around netting panel [ 16 ]. This will provide an effective way to visualize flow pattern so as to explain differences in drag of different netting panels.…”

Section: Discussionmentioning

confidence: 99%

Hydrodynamic characteristics of knotted and knotless purse seine netting panels as determined in a flume tank

Tang

2018

PLoS ONE

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Nylon (PA) netting is widely used in purse seines and other fishing gears due to its high strength and good sinking performance. However, hydrodynamic properties of nylon netting of different characteristics are poorly understood. This study investigated hydrodynamic characteristics of nylon netting of different knot types and solidity ratios under different attack angles and flow velocities. It was found that the hydrodynamic coefficient of netting panels was related to Reynolds number, solidity ratio, attack angle, knot type and twine construction. The solidity ratio was found to positively correlate with drag coefficient when the netting was normal to the flow (CD90), but not the case when the netting was parallel to the flow (CD0). For netting panels inclined to the flow, the inclined drag coefficient had a negative relationship with the solidity ratio for attack angles between 0° and 50°, but a positive relationship for attack angles between 50° and 90°. The lift coefficient increased with the attack angle, reaching the culminating point at an attack angle of 50°, before subsequent decline. We found that the drag generated by knot accounted for 15–25% of total drag, and the knotted netting with higher solidity ratio exhibited a greater CD0, but it was not the case for the knotless netting. Compared to knotless polyethylene (PE) netting, the drag coefficients of knotless PA netting were dominant at higher Reynolds number (Re>2200).

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Section: Discussionmentioning

confidence: 99%

Hydrodynamic characteristics of knotted and knotless purse seine netting panels as determined in a flume tank

Tang

2018

PLoS ONE

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“…The drag force was calculated as the sum of values from the measurement positions 1, 2, 3, and 4. Here, the value of the hydrodynamic coefficient for the copper fish cage was based on the results of Cha et al (2013). For attack angles below 30, the coefficients of the copper alloy nets were approximately 200% of value of the fabric nets.…”

Section: Simulation Conditionsmentioning

confidence: 99%

Dynamic behavior and deformation analysis of the fish cage system using mass-spring model

Lee

Park

2015

China Ocean Eng

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Fish cage systems are influenced by various oceanic conditions, and the movements and deformation of the system by the external forces can affect the safety of the system itself, as well as the species of fish being cultivated. Structural durability of the system against environmental factors has been major concern for the marine aquaculture system. In this research, a mathematical model and a simulation method were presented for analyzing the performance of the large-scale fish cage system influenced by current and waves. The cage system consisted of netting, mooring ropes, floats, sinkers and floating collar. All the elements were modeled by use of the mass-spring model. The structures were divided into finite elements and mass points were placed at the mid-point of each element, and mass points were connected by springs without mass. Each mass point was applied to external and internal forces, and total force was calculated in every integration step. The computation method was applied to the dynamic simulation of the actual fish cage systems rigged with synthetic fiber and copper wire simultaneously influenced by current and waves. Here, we also tried to find a relevant ratio between buoyancy and sinking force of the fish cages. The simulation results provide improved understanding of the behavior of the structure and valuable information concerning optimum ratio of the buoyancy to sinking force according to current speeds.

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“…본 연구에서는 전복의 생육이 해수의 수 온과 용존산소 등에 의해 영향을 받는다는 점 (Naylor et al, 2011;Park et al, 2011;Kim et al, 2005Kim et al, , 2006 PIV 실험은 망지의 후류를 실험한 것과 같은 방법으로 진행 되었는데 (Bae et al, 2006(Bae et al, , 2011Cha et al, 2013), 회류 수조에 모형 전복가두리를 설치하고 particle (Sliver Coated Hollow Glass Spheres, 13 microns, Potter Industries (Cha et. al, 2013).…”

Section: 그러나 폐사의 원인을 파악하고 이를 해결하기 위한 본격적unclassified

Analysis of Current Distribution around a Scaled-down Abalone System to determine the cause of mass mortality of abalone, Haliotis discus hannai (Ino, 1952)

Cha¹,

Choi²,

Yang³

et al. 2014

The Korean Journal of Malacology

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This study is aimed at figuring out the reasons of the mass mortality of abalone and the increase in its mortality rate in the sea cage. The study suggests that lack seawater circulation in an abalone aquaculture cage is an important culprit for it. We analyzed the current distribution around a 1/20 scaled-down abalone unit cage of 4 rows and 10 columns by fluid flow visualization technique (PIV : Particle Image Velocimetry). The speed of current in the model cage definitely slowed down in the first column of a unit cage. We also observed currents going down to the bottom of a water tank from the unit cages placed in the middle. The speed of wakes behind inside the row in the middle was slower than that outside the row. Water velocity inside and outside a real abalone cage at Nowha Island adjacent to Wan Island was measured to verify results from the tank test. The speed of current in front of the cage by 2 m was 0.11 m/sec while it was only 0.0009 m/sec inside the cage. It had similar findings with those of a tank test.

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Analysis of the hydrodynamic characteristics of chain-link woven copper alloy nets for fish cages

Cited by 38 publications

References 22 publications

Hydrodynamic characteristics of knotted and knotless purse seine netting panels as determined in a flume tank

Hydrodynamic characteristics of knotted and knotless purse seine netting panels as determined in a flume tank

Dynamic behavior and deformation analysis of the fish cage system using mass-spring model

Analysis of Current Distribution around a Scaled-down Abalone System to determine the cause of mass mortality of abalone, Haliotis discus hannai (Ino, 1952)

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