Hybrid LES / RANS simulation of a Mach 5 compression- Corner interaction

Jack R. Edwards, Jung Il Choi, John A. Boles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


Simulations of Mach 5 turbulent flow over a twenty-eight degree compression corner are performed using a hybrid large-eddy / Reynolds-averaged Navier-Stokes (LES/RANS) method. The model captures the mean-flow structure of the interaction reasonably well, with observed deficiencies relating to an under-prediction of the displacement effects of the shock-induced separation region. The computational results provide some support for a recent theory concerning the underlying causes of low-frequency shock wave oscillation. In the simulations, the sustained presence of a collection of streaks of fluid with lower / higher momentum than the average induces a low-frequency undulation of the separation front. Power spectra obtained at different streamwise stations are in good agreement with experimental results, indicating that the hybrid LES/RANS model is capable of predicting both low- and high-frequency dynamics of the interaction. Downstream of re-attachment, the simulations capture a three-dimensional mean-flow structure, dominated by counter-rotating vortices that produce wide variations in the surface skin friction. Predictions of the structure of the re-attaching boundary layer agree well with experimental Pitot pressure measurements. In comparison with Reynolds-averaged model predictions, the hybrid LES/RANS model predicts more amplification of the Reynolds stresses and a broadening of the Reynolds stress distribution within the boundary layer that is probably due to reattachment shock motion.

Original languageEnglish
Title of host publication46th AIAA Aerospace Sciences Meeting and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479373
Publication statusPublished - 2008

Publication series

Name46th AIAA Aerospace Sciences Meeting and Exhibit

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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