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Numerical simulation of the hydrodynamics within octagonal tanks in recirculating aquaculture systems

Chinese Journal of Oceanology and Limnology 2017年第4期35卷 912-920页

作者：柳瑶刘宝良雷霁霖关长涛黄滨 Key Laboratory for Sustainable Development of Marine Fisheries Ministry of AgricultureYellow Sea Fisheries Research InstituteChinese Academy of Fishery Sciences Shandong Univercity WeihaiMarine College

A three-dimensional numerical model was established to simulate the hydrodynamics within an octagonal tank of a recirculating aquaculture system. The realizable k-e turbulence model was applied to describe the flow, the discrete phase model （DPM） was applied to generate particle trajectories, and the governing equations are solved using the finite volume method. To validate this model, the numerical results were compared with data obtained from a full-scale physical model. The results show that：（1） the realizable k-e model applied for turbulence modeling describes well the flow pattern in octagonal tanks, giving an average relative error of velocities between simulated and measured values of 18% from contour maps of velocity magnitudes; （2） the DPM was applied to obtain particle trajectories and to simulate the rate of particle removal from the tank. The average relative error of the removal rates between simulated and measured values was 11%. The DPM can be used to assess the self-cleaning capability of an octagonal tank; （3） a comprehensive account of the hydrodynamics within an octagonal tank can be assessed from simulations. The velocity distribution was uniform with an average velocity of 15 cm/s; the velocity reached 0.8 m/s near the inlet pipe, which can result in energy losses and cause wall abrasion; the velocity in tank corners was more than 15 cm/s, which suggests good water mixing, and there was no particle sedimentation. The percentage of particle removal for octagonal tanks was 90% with the exception of a little accumulation of 〈5 mm particle in the area between the inlet pipe and the wall. This study demonstrated a consistent numerical model of the hydrodynamics within octagonal tanks that can be further used in their design and optimization as well as promote the wide use of computational fluid dynamics in aquaculture engineering.

关键词： recirculating aquaculture systems octagonal tanks hydrodynamic simulation rate of particle removal

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Dynamic simulation based method for the reduction of complexity in design and control of recirculating aquaculture systems

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Information Processing in Agriculture 2016年第3期3卷 146-156页

作者： M.Varga S.Balogh Y.Wei D.Li B.Csukas Kaposvar University Department of Information TechnologyResearch Group on Process Network Engineering40 Guba S7400 KaposvarHungary China Agricultural University 17 Tsinghua East RoadBeijing 100083China

In this work we introduce the“Extensible Fish-tank Volume Model”that can reduce the complexity in the design and control of the recirculating aquaculture *** the developed model we adjust the volume of a single fish-tank to the prescribed values of stocking density,by controlling the necessary volume in each time *** developed an advantageous feeding,water exchange and oxygen supply strategy,as well as considering a compromise scheduling for the fingerling input and product fish output,we divide the volume *** function into equidistant parts and calculate the average volumes for these *** these average values with the volumes of available tanks,we can plan the appropriate *** elaborated method is a good example for a case,where computational modeling is used to simulate a‘‘fictitious process model”that cannot be feasibly realized in the practice,but can simplify and accelerate the design and planning of real world processes by reducing the complexity.

关键词： recirculating aquaculture systems Complexity reduction Dynamic simulation Model controller Direct Computer Mapping

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