提高分离紊流计算精度的探讨

本文以有压管道孔板流动为典型,探讨改善分离紊流数值计算的途径。研究表明,采用考虑曲率修正的k—ε紊流模型,可显著提高回流区长度的预测精度。采用高阶计算格式如QUICK格式,有助于提高流场计算结果的分辨率。本文还报导了采用加密网格及对角点附近的控制体进行修正等方法对计算结果的影响。

On Numerical Prediction of Flows with Separation

Present paper is aimed to improve the prediction of flow with separation. Flow in tunnel with orifice pates is chosen as test cases. It is shown that by use of curvature modification version of k-e turbulence model, the piediction precision of recirculation length can be significantly increased. The numerical results show that with higher order scheme QUICK, the resolution of the calculated flow field can be improved. Present paper also evaluates the effec's of grid refinement and corner correction on the calculated results.