Accession Number : ADA496402


Title :   Hybrid LES of Detonations in Reacting Multi-Phase Mixtures


Descriptive Note : Final rept. 1 Dec 2005-30 Nov 2008


Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING


Personal Author(s) : Menon, Suresh ; Genin, Franklin


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a496402.pdf


Report Date : 28 Feb 2009


Pagination or Media Count : 166


Abstract : 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.


Descriptors :   *CROSS FLOW , *TURBULENCE , VORTICES , HYBRID SYSTEMS , NAVIER STOKES EQUATIONS , DETONATIONS , COMPRESSIVE PROPERTIES , METHODOLOGY , SHEAR PROPERTIES , SHOCK


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE