基于Fluent的低雷诺数突扩圆管流场的数值模拟

Low Reynolds Number Numerical Simulation of Sudden Expansion Pipe Flow Based on Fluent

针对突然扩大的管道流动这一流动现象,使用hypermesh软件建立了突扩管的物理模型,在低雷诺数条件下应用Fluent对水流的管路突扩情况进行了不同雷诺数和不同扩张比下的管内流体的流动形态数值模拟。通过Ensight和Grapher等后处理软件对计算结果进行了图像和数据的处理,分析了管路突扩回流时速度和压力的分布情况,总结了突扩管的阻力系数变化规律。模拟结果可以很好地反映突扩管流的基本特征,对生产中相关产品的改善提供理论依据。

For the study of sudden expansion pipe flow, the physical model of the sudden expansion pipe was established by the software of hyper mesh. Fluent was applied to the numerical simulation of turbulence with different Reynolds number and different expansion ratio. Calculation results include the images and data,which were processed by post-processing software Ensight and Grapher. Through the analysis of velocity and pressure of the back flow in the sudden expansion pipe, the resistance coefficient change law was summarized. Simulation results can reflect the basic characteristics of the sudden expansion pipe flow, which could provide theoretical basis for the improvement of related products in production.