Journal of Dalian Ocean University  2023, Vol. 38 Issue (5): 839-847 DOI: 10.16535/j.cnki.dlhyxb.2022-340 |
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| Numerical simulation of the effect of cultured fish on the hydrodynamics in a aquaculture tank |
| SHI Xianying，LI Meng，HUANG Zhengzheng，FENG Dejun，REN Xiaozhong*，LIU Hangfei，SUN Wei
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| 1.College of Ocean and Civil Engineering，Dalian Ocean University，Dalian 116023，China；2.Key Laboratory of Environment Controlled Aquaculture (Dalian Ocean University)，Ministry of Education，Dalian 116023，China；3.National Engineering Research Center for Marine Aquaculture，Zhejiang Ocean University，Zhoushan 316022，China；4.College of Agricultural Engineering and Food Science，Zhejiang University，Hangzhou 310058，China |
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Abstract In order to investigate influence of fish on flow field characteristics of the aquaculture tank, the model of rounded square aquaculture tank with single inlet and cultured fish was established based on computational fluid dynamics (CFD), and the multiple reference frame method (MRF) was adopted to simulate the movement of fish under a fixed track. Influence of culture density, individual volume size and spatial distribution of fish in tanks on fluid flow characteristics in the aquaculture tanks was analyzed. Results revealed that the increase in culture density causes a great drop in average flow velocity in the aquaculture tanks under the same individual volume size and spatial distribution conditions. The upstream movement of fish makes high resistance to the flow and much greater drop in average flow velocity at the fixed culture density, and large school of fish (while the individual volume size is small). The maximal average flow velocity drops and turbulence intensity rise in the aquaculture tank caused by the school are observed at the fixed culture density and individual volume size, and distribution of the school of fish in the middle layer of the water. There were the least influences of the school on average flow velocity and turbulence intensity at the fixed culture density and individual volume size, and distribution of the school of fish in the lower layer of the water. Therefore, inlet current velocity of the aquaculture tank was properly adjusted, with culture density, individual volume size and spatial distribution to maintain flow field condition suitable for fish survival and growth.
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Published: 08 November 2023
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