Statics of a gillnet placed in a uniform current

Wu, Rong; Huang, Weicheng; Song, Xiancang; Hu, Fuxiang; Tokai, Tadashi

doi:10.1016/j.oceaneng.2004.02.005

Cited by 15 publications

(2 citation statements)

References 1 publication

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“…Numerical simulations of the drag force and deformation of the net cage in uniform flow were conducted using a finite element method. In previous studies, the numerical procedure had been used to analyze the tension and shape of the fish netting system [15][16][17][18]. The mesh bar of the netting panel was modeled using a straight-line element with negligible bending and torsional stiffness ( Figure 2).…”

Section: Net Cage Specificationsmentioning

confidence: 99%

Effects of Design Factors on Drag Forces and Deformations on Marine Aquaculture Cages: A Parametric Study Based on Numerical Simulations

Dong

You

2020

JMSE

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In Japan, the marine aquaculture net cage has an important role in farming pacific bluefin tuna farming in oceans, and the design of the net cage needs to ensure robustness against hostile oceanic conditions. Accordingly, this study focuses on the drag forces and the cage volume of the net cage, and on their variations induced by different design parameters (netting solidity ratio, netting height, and bottom weight). A series of parametric studies on drag force and deformation of the net cage was conducted using a numerical simulation model. Accordingly, the contribution of each parameter to the drag and volume was analyzed using a generalized additive model. The results indicate that the bottom weight had the highest contribution to the holding ratio of the cage volume, whereas the netting height had the highest contribution to the drag coefficient of the net cage. Finally, a fast prediction model was created by a backpropagation (BP) neural network model and was examined for the accurate prediction of the objective variables.

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Section: Net Cage Specificationsmentioning

confidence: 99%

Effects of Design Factors on Drag Forces and Deformations on Marine Aquaculture Cages: A Parametric Study Based on Numerical Simulations

Dong

You

2020

JMSE

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“…The monitoring system may also be applied to protect fishing gear in case of deep-water turbulences. Even though there have been experiments [17,18] and numerical simulations [19,20] investigating the dynamic behaviors of the gillnet, these have only focused on small sections of the gillnet. This means that there has been no publication in the open literature which has attempted to investigate not only the global behaviors of the bottom-set gillnet but also the simulations of transient responses with various scenarios of line failures, which could be applied to the development of a sensor-based monitoring system.…”

Section: Introductionmentioning

confidence: 99%

Monitoring-System Development for a Bottom-Set Gillnet through Time-Domain Dynamic Simulations

Jin

Kim

et al. 2019

Applied Sciences

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This paper investigates the sensor-based monitoring feasibility of a bottom-set gillnet through time-domain dynamic simulations for various current and wave conditions and failure scenarios. The dimension and design parameters of the bottom-set gillnet were based on an existing model used in Korea, and the measured environmental data were acquired from the southwest coast of Korea and utilized for the dynamic analysis. For efficient numerical modeling of nets, an equivalent net model which uses fewer line elements was considered, and the projected area, wet weight, and axial stiffness were accordingly adjusted. The hydrodynamic forces on the entire gillnet were estimated using a Morison-force model on the instantaneous positions of the net. The designed gillnet provided excellent stretching performance even under low current velocity. The dynamic responses under wave excitations were not significant in operating conditions; however, significant motions were observed in the fishery-prohibition condition. The proposed monitoring system consisted of an accelerometer, tension sensors, and the global positioning system. Numerous line-failure scenarios were simulated, and the proposed monitoring system could effectively detect a specific problem from the combined patterns of sensor signals by a problem-detection algorithm.

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An improved Morison hydrodynamics model for knotless nets based on CFD and metamodelling methods

Huang

Wang

et al. 2022

Aquacultural Engineering

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Statics of a gillnet placed in a uniform current

Cited by 15 publications

References 1 publication

Effects of Design Factors on Drag Forces and Deformations on Marine Aquaculture Cages: A Parametric Study Based on Numerical Simulations

Effects of Design Factors on Drag Forces and Deformations on Marine Aquaculture Cages: A Parametric Study Based on Numerical Simulations

Monitoring-System Development for a Bottom-Set Gillnet through Time-Domain Dynamic Simulations

An improved Morison hydrodynamics model for knotless nets based on CFD and metamodelling methods

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