低雷诺数下不同湍流模型和差分格式对典型流场数值模拟预测的影响研究

Study on the Influence of Different Turbulence Models and Discretization Schemes on the Numerical Simulation of the Typical Flow Field under Low Reynolds Number

由于湍流理论和数值模拟方法本身的局限,采用CFD来预测低雷诺数的流场本身存在一定的难度,同时各种计算模型的设置对于最后的计算精度也有很大的影响。选用了标准k-ε、RNG k-ε、Realizable k-ε三种常用的湍流模型以及一阶迎风格式、二阶迎风格式、QUICK格式三种常用的差分格式对一个简化的典型流场进行模拟预测,对比分析不同的模拟设置变化对于流场计算结果的影响。

Owing to the limitation of turbulence theory and numerical simulation method,it is difficult to predict the flow field under low Reynolds number by using computational fluid dynamic(CFD).In addition,the calculation setting of the models also has a great influence on the final calculation accuracy.In this present study,the author selected the standard k-ε,RNG k-ε,Realizable k-εthree commonly used turbulence model and the First order Upwind scheme,Second Order Upwind scheme and QUICK scheme three common discretization scheme for simulating a simplified typical flow fields,and then the influence of different simulation settings on the results of flow field calculation were compared and analyzed.