Preliminary Study on Hypersonic Correction of γ-Reθt Transition Model Based on Fluent UDF

In order to improve the accuracy of γ-Re_θt transition model in hypersonic transition prediction, Mach number and Reynolds number were introduced into the γ-Re_θt transition model to reflect the compressible effect of hypersonic flow, and based on response surface methodology, the fitting relationship between vortex Reynolds number and momentum thickness Reynolds number was reconstructed, so that the γ-Re_θt transition model can be applied to hypersonic flow. Considering the practical application, the user-defined function（UDF） was used to modify the Re_θc and F_length functions of the γ-Re_θt transition model in commercial software Fluent, and the modified γ-Re_θt transition model was tested and verified by using hypersonic plate and blunt cone. Compared with the original γ-Re_θt transition model and experimental data, the improved γ-Re_θt transition model can successfully predict the change of stanton number caused by boundary layer transition, and the prediction accuracy of transition starting position is significantly improved compared with the original model.