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Analysis and optimization of fish pond flow field based on CFD simulation and PIV technology

    

  1. 1.Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, China；
    Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai 200092, China；
    2 Ocean Fishery Associated Lab, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;
    3  Shanghai Aquatic Wildlife Conservation and Research Center, Shanghai 200092, China）
  • Online:2022-04-20 Published:2022-07-12

基于CFD模拟及PIV技术的鱼池流场分析与优化

  1. （1 中国水产科学研究院渔业机械仪器研究所，农业农村部渔业装备与工程技术重点实验室，上海 200092；
    2 青岛海洋科学与技术国家实验室深蓝渔业工程装备联合实验室，山东青岛 266237；
    3 上海市水生野生动植物保护研究中心，上海 200092）
  • 通讯作者: 吴凡（1973—），男，研究员，研究方向：渔业装备与工程。E-mail：wufan@fmiri.ac.cn
  • 作者简介:张成林（1984—），男，副研究员，研究方向：渔业装备与工程。E-mail：zhangchenglin@fmiri.ac.cn
  • 基金资助:
    上海市科技兴农重点攻关项目（沪农科创字（2018）第1-9号）；山东省支持青岛海洋科学与技术试点国家实验室重大科技专项（2018SDKJ0303）；中国水产科学研究院科技创新团队项目（2020TD78）

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Abstract: Based on the theory of Computational Fluid Dynamics (CFD), the numerical simulation and verification method of the circular tank flow field were studied based on the large-scale computational fluid dynamics software Fluent and Particle Image Velocimetry (PIV).
A set of three-dimensional turbulent flow numerical simulation model of fish pond is established. The optimal velocity and appropriate flow field are obtained by fitting the inlet flow, inlet diameter and inlet height, and the velocity distribution and particle trajectory are analyzed; PIV technology is used to measure the flow field in the fish pond to understand the flow field and particle movement information in the fish pond.  The results show that the appropriate influent parameters could make the flow field of the circular tank more in line with the actual needs in terms of stability, sewage discharge performance and energy saving. Compared with PIV test results, the numerical simulation results are in good agreement with the flow structure of circular tank flow field, and the numerical error is basically kept within 8%, which further indicates that the numerical calculation and performance prediction in this paper can reach a certain accuracy. Finally, according to the organic combination of CFD simulation and PIV technology, a relatively complete set of fish pond flow field analysis method can be formed, which can provide research means and theoretical basis for the construction and optimization of circular tank structure in the future.

Key words: recirculating aquaculture；circular tank；flow field；Computational Fluid Dynamics（CFD）；Particle Image Velocimetry（PIV）
 

摘要： 以计算流体力学（CFD）理论为基础，基于大型计算流体力学软件Fluent和粒子跟踪测速技术（PIV），开展鱼池流场流态数值模拟与验证方法研究。建立了一套鱼池的三维湍流流动数值模拟模型，通过拟合进水流量、进水口直径和进水高度来获得最佳流速和适宜的流场，分析流速分布和颗粒物运动轨迹；利用PIV技术对鱼池流场进行试验测量，了解鱼池流场及颗粒物运动信息。结果显示：合适的进水参数可使鱼池流场无论从稳定性、排污性能和节能方面都更符合实际使用需要，数值模拟结果与PIV实测试验结果对比基本吻合，符合鱼池流场的流动特征，数值误差基本保持在8 %以内，进一步表明本研究的数值计算和性能预测均能达到一定的精度，可有效掌握鱼池内部三维流动结构和基本流态。CFD数值模拟与PIV技术有机结合，可形成较完整的鱼池流场分析方法，可为今后鱼池的结构设计提供研究手段及理论依据。

关键词: 循环水养殖, 鱼池, 流场, 计算流体力学（CFD）, 粒子图像测速（PIV）