四种常用湍流模型在二维后向台阶流数值模拟上的性能比较

Comparison of Performance of Four Commonly-used Turbulence Models in Numerically Simulating Two-dimensional Backward-facing Step Turbulent Flows

利用Fluent软件的四种常用湍流模型(k-ε湍流模型、RNG k-ε湍流模型、Realizable k-ε湍流模型、以及k-ω湍流模型)对雷诺数(Re)处于200到6 500之间的二维后向台阶流的性能进行比较分析。得到了各种模型下具有不同雷诺数的瞬时平均流场和时均流场的分布特征,得到了回流区长度和涡心位置与Re的关系,并与齐鄂荣等人所作的实验结果进行了对比分析。

In the paper, the performances of four commonly-used turbulence models （k-εturbu- lence model, RNG k-εturbulenee model, Realizable k-εturbulenee model, and k-ωturbulence model） are compared by using Fluent to numerically simulate two-dimensional backward-facing step turbulent flows with the Reynolds number in the range of 200 to 6 500. The numerical simulations give the instantaneous mean flow fields and time-averaged flow fields predicted by each turbulence model for various Reynolds and the relation between the length of the back flow region and the Reynolds number. All numerical results are also compared to the experimental re- suits obtained by Qi et al.