A Study of Supersonic Compression-Corner Interactions using Hybrid LES/RANS Models
Abstract
This research has developed a new hybrid large-eddy /Reynolds-averaged Navier-Stokes turbulence closure strategy specifically designed for strongly interacting, wall-bounded flows. The model differs from its predecessor in that the need to pre-calibrate a model constant is removed through the use of ensemble-averaged turbulence information to estimate an outer-layer turbulence length scale. The model has been applied to a variety of shock / boundary layer interactions and has shown a good level of predictive capability for both mean and second-moment quantities. A specific result of the shock / boundary layer interaction study is a strong correlation between the most probable time of a fluid within the recirculation region formed through shock interaction and the dominant low-frequency signal of the interaction. This provides evidence that the appearance of a low-frequency mode of separation-shock unsteadiness is intimately connected with the structure of the backflow region and the mean entrainment patterns. With this knowledge in place, it may be possible to predict low-frequency dynamics of complicated interactions by examination of the mean structure of the interactions. The LES/RANS model was also tested for turbulent flow over an airfoil near static stall as an initial step toward its use in predicting dynamic stall
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 20, 2014
- Accession Number
- ADA605092
Entities
People
- Jack R. Edwards
Organizations
- North Carolina State University