Numerical modelling of fluid flows in a recirculating aquaculture system

循环水产养殖系统中流体流动的数值模拟

• 批准号: 512241-2017
• 负责人: Soliman, Hassan
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640641
• 关键词: Numerical; modelling; fluid; flows; recirculating

A new, innovative, recirculating aquaculture system (RAS) has been developed by the Myera Group that wants to be a leader in food security solutions for remote regions. The RAS is based on a modular tank design that provides for targeted feeding, medication, and environmental control in the raising of fish stocks. The novel design uses an airlift pumping mechanism to control water velocity for optimising fish health through exercise, while simultaneously promoting gas exchange and removal of waste.The fluid flow in the airlift pump involves a very complicated combination of two-phase (gas-liquid) bubbly flow with mass exchange. The parameters that interact to change the fluid velocity and air exchange are the mass flow rate of air, the bubble size, the air lift duct geometry, and the piping connections to the modular tank. Predicting how changing any of these parameters will affect the performance of the system is very challenging, yet is essential to improve the design of the system.The main aspect of this proposed work is to develop a detailed numerical model of the three-dimensional two-phase fluid flow in the airlift pump of the RAS. This model will use state-of-the-art computational fluid dynamics (CFD) software and validate against experimental data. The resulting model will predict the fluid flow and mass transfer and be responsive to changes in the geometry and operating conditions. The company will be able to use the model for virtual prototyping of design changes. This will save time and money in moving toward improved designs that are needed for full scale production.

Myera 集团开发了一种新型创新循环水产养殖系统 (RAS)，该集团希望成为偏远地区粮食安全解决方案的领导者。 RAS 基于模块化水箱设计，可在鱼类养殖过程中提供有针对性的投喂、用药和环境控制。新颖的设计采用气升泵机构来控制水流速度，通过运动优化鱼类健康，同时促进气体交换和废物清除。气升泵中的流体流动涉及非常复杂的两相（气液）组合具有质量交换的气泡流。相互作用以改变流体速度和空气交换的参数是空气的质量流量、气泡尺寸、空气提升管道几何形状以及与模块化罐的管道连接。预测改变这些参数将如何影响系统的性能是非常具有挑战性的，但对于改进系统的设计至关重要。这项工作的主要方面是开发三维二维的详细数值模型。 RAS 气升泵中的相流体流动。该模型将使用最先进的计算流体动力学 (CFD) 软件并根据实验数据进行验证。生成的模型将预测流体流动和质量传递，并对几何形状和操作条件的变化做出响应。该公司将能够使用该模型进行设计变更的虚拟原型制作。这将节省时间和金钱来改进全面生产所需的设计。