摘要
本文研究单边放大台阶流的数值解。分别采用k-ε-E模型和新近提出的k-ε-S模型,对放大比(Y_0/H)=2和3的单边放大流动进行了计算,并与前人用k-ε-R和k-ε-A模型的计算结果及试验资料进行对比。通过对回流长度、流速分布和雷诺应力的计算,从总体上说,k-ε-S模型的计算结果最接近试验值,表明该模型具有较强的预测能力。
A numerical study is reported on the flow over a backward-facing step. The turbulence models employed are the standard k-ε model.(the k-ε-E model) and the recently proposed model: the k-ε-S model. The computations are made for two different step ratios, (Y_o/H)=2, 3, and the results are compared with the k-ε-A and k-ε-R models, as well as the experimental data. As a consequence, it is concluded that the k-ε-S model generally gives the best results of the four models in the prediction reattachment length, velocity distribution and Reynolds stresses profiles.
