Study of numerical method for flow transition prediction based on turbulence model

Numerical method based on turbulence model to predict flow transition is studied. By using k-ω SST two-equation model to simulate the flat plate boundary layer, it is shown that the k-ω SST model can capture the transition phenomena but the predicted transition point is far prior to the measured position. So, the mixing length scale in the k-ω SST model is modified according to the characteristic of transition flow and a modified k-ω SST two-equation model taking account of intermittence function effect is put forward. By using this modified k-ω SST model to simulate the flat plate boundary layer and the flow past NACA0012 at different incidences, it is seen that rational results are obtained and the modified model can predict the transition position with certain accuracy.