低雷诺数κ-ε封闭模式在三维湍流边界层计算中的应用

CALCULATION OF 3-DIMENSIONAL TURBULENT BOUNDARY LAYER WITH A LOW-REYNOLDS-NUMBER k-ε CLOSURE MODEL

本文采用低雷诺数形式的k-ε湍流模型,计算具有大横向流的不可压缩三维湍流边界层。在湍流模型中,应用了涡粘性的各向异性系数。本文所得结果与用混合长模型所得结果以及量测结果的比较表明:对于边界层的不同特征量,湍流模型和涡粘性各向异性对计算结果的影响程度是不同的。总的来说,应用考虑涡粘性各向异性的k-ε模型,较之应用混合长模型,所得计算结果有所改善,但还不是根本性的改善。

In the present paper the incompressible three-dimensional turbulent boundary layer with strong crossflow was simulated numerically by integrating the boundary-layer equations together with a low-Reyn-olds-number k-ε model of turbulence. The anisotropy of eddy viscosity was taken into account by means of a non-isotropy factor. The computa-tional results have been compared with those of a mixing-length model and with experimental data as well. It is shown that on different features of the boundary layer the influences of turbulence model selection and of the anisotropy of eddy viscosity are different. Generally speaking, the results of the k-ε model with nonisotropic eddy viscosity are better than those of the mixing-length model.