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;MLtransition model could predict accurately the transition and development process.However

the applicability of M-Lone-equation transition model is limited as compared with M-Ltwo-equation transition model

since it depends on how to correctly choose the transition onset momentum thickness Reynolds number by experiences.During calculation with M-Ltransition model

selecting the import viscosity based on the nature of vortex assists in predicting the transition process.