Hybrid LES of Detonations in Reacting Multi-Phase Mixtures
Final rept. 1 Dec 2005-30 Nov 2008
GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING
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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. 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 and 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 study focused on 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.
- Fluid Mechanics