Numerical simulation of the effects of structure size ratio and mesh type on three-dimensional deformation of the fishing-net gravity cage in current

Zhao, Yunpeng; Liu, Yucheng; Dong, Guohai; Gui, Fu-Kun; Teng, Bin

doi:10.1016/j.aquaeng.2007.01.003

Cited by 93 publications

(37 citation statements)

References 8 publications

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“…Alternatively, the deformation of the cage system corresponding to prototype velocity of 0.7 m/s is calculated using the lumped-mass method (Zhao et al, 2007;Xu et al, 2012) (see Fig. 6).…”

Section: Tablementioning

confidence: 99%

Experimental study on flow velocity and mooring loads for multiple net cages in steady current

Zhao

Chen

et al. 2015

Aquacultural Engineering

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“…Alternatively, the deformation of the cage system corresponding to prototype velocity of 0.7 m/s is calculated using the lumped-mass method (Zhao et al, 2007;Xu et al, 2012) (see Fig. 6).…”

Section: Tablementioning

confidence: 99%

Experimental study on flow velocity and mooring loads for multiple net cages in steady current

Zhao

Chen

et al. 2015

Aquacultural Engineering

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“…Moreover, protected river delta production does not guarantee success, as experienced by Vietnamese producers in the Red River Delta, where floods, storms and sea tides frequently inflict significant losses (Stickney 2009). There is an increasing trend to locate aquaculture fish cages offshore, and work has been undertaken to accurately model the deformation of the pen under loading by ocean or tidal currents (Lader and Enerhaug 2005;Zhao et al 2007; Moe et al 2010;Kristiansen and Faltinsen 2012;Zhao et al 2013). This industry is also challenged by environmental concerns, such as biowaste dispersion (Venayagamoorthy et al 2011), parasite growth (Salama and Murray 2011;Torrissen et al 2013) and sea floor deterioration below the farms (Buryniuk et al 2006;Halwart et al 2007).…”

Section: Introductionmentioning

confidence: 99%

The impact of twine/mesh ratio on the flow dynamics through a porous cylinder

et al. 2014

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The impact of the twine/mesh ratio on the flow through a porous hollow cylinder of diameter D has been experimentally investigated at Reynolds number Re = 800 with a surface porosity varying from 0.67 to 0.90. Our porous cylinder models are inspired by aquaculture pens in that they have similar geometries, and porosities, to those nets commonly used within the aquaculture industry. We show that the surface porosity alone is not the key parameter determining the flow topology of the model, but rather a non-dimensional parameter a ¼ t 0:5 D 0:5 =m (based upon twine thickness t, mesh void m and cylinder diameter D) effectively collapses first-order moments. Three different wake regimes are observed in the flow for different twine/mesh ratios: a laminar flow regime where streamlines pass through the model without significant deformation; a partially occluded flow, where the mean flow is decelerated, and a flow with a fully developed recirculation zone exhibiting a von Kármán vortex street similar to that produced in the wake of a solid cylinder. Our observation that the flow structure depends upon the parameter a, rather than simply the surface porosity, is supported by calculated dispersion times of virtual particles released both inside the model and within the wake. The particle distributions display three distinct dispersion behaviours, from nearly linear to a logarithmic decay slower than that of a solid cylinder, thus emphasising the existence of multiple flow regimes and the importance of the relative twine/mesh ratio.

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“…Lader et al (2003) and Lader and Enerhaug (2005) conducted a series of experiments and developed computational models to investigate the force and deformation on a net cage exposed in waves and current. Li et al (2006) and Zhao et al (2007) used a lumped-mass method to simulate the hydrodynamic behavior of a deep-water gravity-type cage. Lee et al (2008) proposed a mass-spring model for analyzing the performance of a fish cage system influenced by currents and waves.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic analysis of elastic floating collars in random waves

et al. 2015

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As the main load-bearing component of fish cages, the floating collar supports the whole cage and undergoes large deformations. In this paper, a mathematical method is developed to study the motions and elastic deformations of elastic floating collars in random waves. The irregular wave is simulated by the random phase method and the statistical approach and Fourier transfer are applied to analyze the elastic response in both time and frequency domains. The governing equations of motions are established by Newton's second law, and the governing equations of deformations are obtained based on curved beam theory and modal superposition method. In order to validate the numerical model of the floating collar attacked by random waves, a series of physical model tests are conducted. Good relationship between numerical simulation and experimental observations is obtained. The numerical results indicate that the transfer function of out-of-plane and in-plane deformations increase with the increasing of wave frequency. In the frequency range between 0.6 Hz and 1.1 Hz, a linear relationship exists between the wave elevations and the deformations. The average phase difference between the wave elevation and out-of-plane deformation is 60° with waves leading and the phase between the wave elevation and in-plane deformation is 10° with waves lagging. In addition, the effect of fish net on the elastic response is analyzed. The results suggest that the deformation of the floating collar with fish net is a little larger than that without net.

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Numerical simulation of the effects of structure size ratio and mesh type on three-dimensional deformation of the fishing-net gravity cage in current

Cited by 93 publications

References 8 publications

Experimental study on flow velocity and mooring loads for multiple net cages in steady current

Experimental study on flow velocity and mooring loads for multiple net cages in steady current

The impact of twine/mesh ratio on the flow dynamics through a porous cylinder

Hydrodynamic analysis of elastic floating collars in random waves

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