Numerical analysis of fish farm behaviour in real operational conditions

Gutiérrez-Romero, José Enrique; Lorente-López, A. J.; Parra, Blas Zamora

doi:10.1080/17445302.2019.1671674

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…The structural performance of aquaculture equipment represents a critical aspect of its design and optimization. The finite element method (FEM) and physical experiments are typically used for structural strength analyses of such equipment [3][4][5][6]. Such analyses help identify potential failure modes and optimize the equipment's structural configura-tion.…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design and Structural Performance Analysis of an Innovative Deep-Sea Aquaculture Platform

Li,

Zhen,

Zhu

et al. 2024

JMSE

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This paper proposes a conceptual design of an innovative deep-sea aquaculture platform that integrates a steel structural framework and high-density polyethylene (HDPE) floats. It aims to overcome the limitations of prevailing aquaculture equipment, including inadequate resistance to strong wind and waves, complex technologies, and prohibitively high costs. The design scheme and key parameters of the main platform, the netting system, and the mooring systems are presented. Based on the stochastic design wave method, the characteristic load response scenarios and design wave parameters are determined and analyzed. Strength analysis is conducted to assess the structural performance, vulnerabilities, and overall safety of the platform under various characteristic load conditions. The results indicate that the Von Mises stress levels across different sections of the platform conform to the allowable stress thresholds under various characteristic load conditions. However, the stress levels of the platform are notably higher when subjected to characteristic loads associated with vertical shear, vertical bending moments, and torsion about the horizontal axis, which requires further efforts in the design process to enhance the structural safety of the platform. The proposed design methodology and the presented research results can provide a wide range of references for the design and analysis of deep-sea fisheries aquaculture equipment.

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Section: Introductionmentioning

confidence: 99%

Conceptual Design and Structural Performance Analysis of an Innovative Deep-Sea Aquaculture Platform

Li,

Zhen,

Zhu

et al. 2024

JMSE

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“…An interesting feature of these problems is the study of mooring lines and deformation of the fish cage under the actions of waves and currents. For instance, the influence on the fish farm mooring behaviour in different sea states using numerical computational fluid dynamics (CFD) model simulations were studied in [19]. In two-dimensional Cartesian coordinates, under steady currents and floater oscillations, the hydroelastic response of full-scale floater-and-net systems was investigated in [20].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Effect of Currents on the Dynamics of a Moored Flexible Cylindrical Net Cage

Liu

Mohapatra

Soares

2021

JMSE

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A numerical model associated with wave–current interactions with a moored flexible cylindrical cage was developed based on the finite element method. An analytical model was formulated under the linearised wave theory and small structural response, and a semi-analytical solution was obtained using the Fourier Bessel series solution and least squares approximation method, along with a matching technique. The numerical results from the finite element analysis of the horizontal displacements for different design parameters under a uniform current were compared with the analytical model solutions. It was seen that they had a good level of agreement with their results. The effects of different current speeds and time on the cage shapes were analysed from the finite element results. Further, the mooring forces on the flexible cage for different values of the cage height and cage radius were also presented. The comparison of the results indicated that the numerical model results could be used with confidence in the design of a flexible cylindrical net cage for applications to offshore aquacultures.

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“…Zhao et al (2013b) established a numerical model for multi-cage fish farm using a porous media model and showed 69% of velocity reduction when the flow passed through 4 cages. Gutiérrez-Romero et al (2020) comprehensively analyzed a fish farm under combined wave and current conditions using a fluid-structure interaction method. All the above studies proved that the numerical method is accurate enough to predict the structural responses of a fish farm under various current and wave conditions.…”

Section: Introductionmentioning

confidence: 99%

Development of Advanced Numerical Tools for Dynamic Analysis of Aquaculture Structures

Cheng¹

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Numerical methods to accurately predict dynamic responses of marine aquaculture structures are essential in the engineering design process, because these structures can be subjected to large wave and current loads in the ocean environment, which causes complex structural motion and deformation. However, only a few numerical programs for the dynamic analysis of aquaculture structures can be accessed by the public without permission. In order to meet the high demand for a ready-for-use program, a numerical module for an open-source Finite Element Analysis (FEA) program, Code_Aster, is developed in this PhD study. This numerical module includes various wave models (e.g., Airy waves, Stokes 2nd order waves and irregular waves) and hydrodynamic force models (e.g., Morison model, Screen model and flow velocity reduction due to wake effects). Moreover, a coupling algorithm to handle the wake effects of thin, flexible and highly permeable structures with complex geometries is also implemented to solve the complex fluid-structure interaction (FSI) problem in marine aquaculture engineering. The accuracy of structural response prediction can be improved using the coupling algorithm with the open-source Computational Fluid Dynamics (CFD) solver, OpenFOAM, which can solve the complex flow field around the structures. Detailed verifications and validations are firstly conducted with considerations of different net solidities, inflow angles, incoming current velocities and net dimensions. Subsequently, the newly developed numerical module is applied to study dynamic responses of traditional fish cages, grid moored fish farms and a large semi-submersible aquaculture structure for practical engineering design and optimization purposes. The structural responses of traditional fish cages with different design parameters (including circumferences of floating collar, depths of net bag, submerged weights) are comprehensively analyzed under pure current conditions. Based on the parametric analysis with a large number of numerical simulations, regression functions for the most concerning aspects are provided for engineering usages in the design process. These regression functions can save considerable time for experiments and numerical simulations in the design of traditional fish cages. The structural responses of grid moored fish farms are analyzed with respect to combinations of mooring line breakages and current directions. Based on the numerical results, suggestions to improve the design of the mooring system are given. It is also recommended to monitor the positions of buoys during in-situ operations. When one of the mooring line breaks, the maximum tension increment in the mooring system can be estimated based on the displacement of the buoys. This estimation can help the farmer to decide whether the damaged mooring line should be repaired immediately. The global responses of a semi-submersible offshore aquaculture structure are investigated under irregular waves and current conditions which correspond to a return period of 50 years. The numerical model shows a reasonable agreement with published experimental results and demonstrates that the newly developed numerical module can be applied to the dynamic analysis of offshore aquaculture structures.

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Numerical analysis of fish farm behaviour in real operational conditions

Cited by 7 publications

References 22 publications

Conceptual Design and Structural Performance Analysis of an Innovative Deep-Sea Aquaculture Platform

Conceptual Design and Structural Performance Analysis of an Innovative Deep-Sea Aquaculture Platform

Finite Element Analysis of the Effect of Currents on the Dynamics of a Moored Flexible Cylindrical Net Cage

Development of Advanced Numerical Tools for Dynamic Analysis of Aquaculture Structures

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