Numerical simulation of the flow field inside and around gravity cages

Zhao, Yunpeng; Bi, Chen; Dong, Guohai; Gui, Fu-Kun; Cui, Yong; Xu, Tiao-Jian

doi:10.1016/j.aquaeng.2012.06.001

Cited by 90 publications

(28 citation statements)

References 5 publications

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“…Governing equations review In the present numerical model, the governing equations comprises the Navier-Stokes equations coupled with the realizable k-ε model, wh ich have been described in details in our previous studies (Bi, Zhao, & Dong, 2015;Zhao et al, 2013), thus a brief review is given here. Navier-Stokes equation are…”

Section: Description Of Numerical Modelmentioning

confidence: 99%

“…A mong the numerical works, Shim, Klebert, and Fredheim (2009) presented the flo w field inside and behind a net cage with various porosities using the porousju mp med ia model. Zhao et al (2013) p roposed a numerical model based on a porous -media fluid model and the flow fields around tandem net cages were simu lated. Cornejo et al (2014) nu merically studied the flow-velocity distribution downstream fro m a salmon farm in semidiu rnal current.…”

Section: Introductionmentioning

confidence: 99%

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Bi¹,

Xu²

2018

Turk. J. Fish. Aquat. Sci.

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The netting of the fish farm, with biofouling or not, was simulated using the porous-media fluid model. The porous coefficients for both clean and biofouled netting were calculated from the drag and lift forces that acts on corresponding clean or biofouled plane net, consequently the relationship between the porous coefficients and the features of the netting as well as the biofouling is established. In this study, both constant and tidal currents through a fish farm, consisting of 2×4 full-scale net cages, were investigated numerically. Effects of cage height, incidence angle of the current and level of biofouling on the netting on the flow field in vicinity region of the fish farm were presented and discussed. Compared with constant current, tidal current produces different flow pattern downstream from the fish farm. Overall, the height of the wake region downstream from the fish farm increases with increasing cage height. The attenuation in flow velocity both inside the net cage and in the wake region increases as the level of biofouling increases. With respect to the incidence angle of the tidal current, the optimal orientation of the fish farm can be determined in certain tidal current from an ecological perspective.

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Section: Description Of Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untitled

Bi¹,

Xu²

2018

Turk. J. Fish. Aquat. Sci.

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“…In Patursson et al (2010) and Zhao et al (2013b), the porous resistance force was modeled by DarcyForchheimer equation as shown in Eq. (9).…”

Section: Appendix a Comparison Of The Two Coordinate Transformation mentioning

confidence: 99%

“…In Patursson et al (2010), Zhao et al (2013a) and Zhao et al (2013b), the porous media model was applied to simulate steady flow through a single net panel with different attack angles, multiple net panels and gravity cages, respectively. Furthermore, in Bi et al (2014a) and Bi et al (2014b), the porous media model was coupled with a lumped mass structural model to account for fluid-structure interaction effect.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the porous resistance coefficients for fishing net structures

Chen

Christensen

2016

Journal of Fluids and Structures

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The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.

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“…There has not been a numerical model focusing on the fluid-structure interaction between flow and a flexible net. As an extension of our previous works [7][8], a coupled fluid-structure model is developed based on a joint use of the porous-media fluid model and the lumped-mass mechanical model. Using an appropriate iterative scheme, the fluid-structure interaction between flow and fishing net can be solved.…”

Section: Introductionmentioning

confidence: 99%