Study of Compressible Turbulent Flows in Supersonic Environment by Large-Eddy Simulation
A Large-Eddy Simulation (LES) methodology adapted to the resolution of high Reynolds number turbulent flows in supersonic conditions was proposed and developed. A novel numerical scheme was designed, that switches from a low-dissipation
central scheme for turbulence resolution to a flux difference splitting scheme in regions
of discontinuities. Furthermore, a state-of-the-art closure model was extended in order
to take compressibility effects and the action of shock / turbulence interaction into account.
The proposed method was validated against fundamental studies of high speed flows and shock / turbulence interaction studies. This new LES approach was employed for the study of shock / turbulent shear layer interaction as a mixing-augmentation technique, and highlighted the efficiency in mixing improvement after the interaction, but also the limited spatial extent of this turbulent enhancement. A second practical
study was conducted by simulating the injection of a sonic jet normally to a supersonic crossflow. The validity of the simulation was assessed by comparison with experimental
data, and the dynamics of the interaction was examined. The sources of vortical structures were identified, with a particular emphasis on the impact of the
flow speed onto the vortical evolution.
Advisor:Menon, Suresh; Seitzman, Jerry; Ruffin, Stephen; Sankar, Lakshmi; Stoesser, Thorsten
School:Georgia Institute of Technology
School Location:USA - Georgia
Source Type:Master's Thesis
Date of Publication:02/19/2009