带有压力梯度的平板边界层转捩数值模拟

对零压力梯度和带有压力梯度的平板边界层转捩实验T3A,T3C1和T3C2进行了数值模拟,计算结果与实验值吻合的较好,并得出以下的结论:压力梯度的存在对转捩起始的位置有较大的影响;M-L转捩模型能比较准确地预测转捩的发生和发展过程,但M-L一方程转捩模型因为要根据经验选取转捩起始动量厚度雷诺数,所以在通用性上相对M-L二方程转捩模型要弱;使用M-L转捩模型计算过程中,根据湍流的性质选取进口粘性比有助于正确地预测转捩的发展过程.

Numerical simulation of boundary layer transition under pressure gradient

Numerical simulation was performed for the flat plate boundary layer transition test at zero and non-zero pressure gradients,T3A,T3C1 and T3C2.The results have been validated through the experimental data,showing that the pressure gradient could have great influence upon the starting position of transition process;ML transition model could predict accurately the transition and development process.However,the applicability of M-L one-equation transition model is limited as compared with M-L two-equation transition model,since it depends on how to correctly choose the transition onset momentum thickness Reynolds number by experiences.During calculation with M-L transition model,selecting the import viscosity based on the nature of vortex assists in predicting the transition process.