Hydrodynamic response of a cage system under waves and currents using a Morison-force model

Cifuentes, Cristian; Kim, M.H.

doi:10.1016/j.oceaneng.2017.06.055

Cited by 68 publications

(38 citation statements)

References 33 publications

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“…Cifuentes and Kim [10] provided a detailed method for developing a cruder, equivalent net model in their time-domain numerical analysis and compared their numerical results, including a wake model, for downstream nets in currents with experiments. Moreover, Cifuentes and Kim [11] have further validated their numerical methods for net dynamics and mooring tensions in currents and waves with experiments. Xu et al [12] studied the hydrodynamic behaviors of a four-cage-coupled system including a comparison between simulations and experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, the utilization of a reliable numerical-simulation tool is essential for analyzing overall dynamic behaviors of various types of fishing cages/gear in site-specific environmental conditions. Morison-force [3][4][5][6][7][8][9][10][11][12][13] and screen-force [14,15] models are the two popular approaches used to analyze fishing gears and nets. In particular, the Morison-force model has been validated with experiments in current and wave conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Jin et al [13] conducted time-domain analyses of a stow net in various current velocities and wave heights and investigated the feasibility of the monitoring system for fishing gears. Authors of [8,10,11,13] have presented many comparisons against various experimental results to consistently validate the developed time-domain simulation tool for various types of nets and cages.…”

Section: Introductionmentioning

confidence: 99%

“…A commercial program, OrcaFlex, was used as a base program and the entire gillnet was rigorously modeled through equivalent line elements and three degrees of freedom (DOF) buoys. Previous studies have included authors' well validated methodologies for the similar applications of fishing cages/gear under waves and currents [3][4][5][6][7][8][9][10][11][12][13]; thus, in this study, we adopted those procedures for dynamic analysis. Since the longitudinal length of a bottom-set gillnet can be up to several kilometers, creating an equivalent net model is essential in modeling, and the equivalent net model was completed by adjusting the projected area, wet weight, and axial stiffness.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jin

Kim

et al. 2019

Applied Sciences

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“…Cifuentes and Kim [11] conducted numerical simulations of a fishing net in currents, and a wake model was applied to downstream nets. In addition, Cifuentes and Kim [12] further investigated dynamic behaviors of fishing nets under wave and current excitations. Cifuentes and Kim [13] also investigated the coupled dynamics of a complex system including SPM-buoy-feeder-cage.…”

Section: Introductionmentioning

confidence: 99%

Response Prediction and Monitoring Feasibility of a Stow Net System Using Measured Environmental Data in the Southwest Coast of Korea

2018

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This paper investigates the response characteristics of a stow net under wave and current excitations, as well as the feasibility of its monitoring system to check net functionality and prevent loss of fishing gears. The stow-net model is based on one of existing types used in southwest coast of South Korea. The measured wave and current data there are acquired and inputted as environmental loads for numerical simulations. The Morison equation for a moving object with equivalent net model is utilized as the external-force estimator, which has been validated by many researchers regarding fish-cage studies. Since the modelling of all the net elements is inefficient in terms of computational time in time-domain simulations, cruder equivalent-drag net elements are devised with equivalent wet mass, projected area, and axial stiffness. The performance of stow net is highly influenced by current velocity. Stow nets submerge more in stronger currents, which results in less wave forces. The proposed monitoring system can provide useful information, such as net functionality and loss of stow net, using the minimum number of monitoring sensors.

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Aquaculture Structures: Numerical Methods

Shen

Yang

2022

Encyclopedia of Ocean Engineering

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Hydrodynamic response of a cage system under waves and currents using a Morison-force model

Cited by 68 publications

References 33 publications

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

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

Response Prediction and Monitoring Feasibility of a Stow Net System Using Measured Environmental Data in the Southwest Coast of Korea

Aquaculture Structures: Numerical Methods

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