DU Yufeng, CAO Yonghong, ZHOU Ling, LI Mengwei. Preliminary Study on Hypersonic Correction of γ-Reθt Transition Model Based on Fluent UDF[J]. Journal of North University of China(Natural Science Edition), 2023, 44(3): 200-208.
Citation: DU Yufeng, CAO Yonghong, ZHOU Ling, LI Mengwei. Preliminary Study on Hypersonic Correction of γ-Reθt Transition Model Based on Fluent UDF[J]. Journal of North University of China(Natural Science Edition), 2023, 44(3): 200-208.

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

  • In order to improve the accuracy of γ-Reθt transition model in hypersonic transition prediction, Mach number and Reynolds number were introduced into the γ-Reθt 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-Reθt transition model can be applied to hypersonic flow. Considering the practical application, the user-defined function(UDF) was used to modify the Reθc and Flength functions of the γ-Reθt transition model in commercial software Fluent, and the modified γ-Reθt transition model was tested and verified by using hypersonic plate and blunt cone. Compared with the original γ-Reθt transition model and experimental data, the improved γ-Reθt 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.
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