Coupled Jet-Interaction Base Flow Simulation

The program focuses on turbulence modeling enhancements for predicting coupled jet interaction baseflows. Unified kε turbulence model, and varied extensions that provide for scalar fluctutation models (SFM), baroclinic torque effects, realizability constrainst, vorticity/strain non-equilibrium effects, etc. will be systematically evaluated. Complimentary Large Eddy Simulations (LES) and hybrid RANS/LES simulations will provide additional turbulence statistics that are not readily/reliably measured. The LES data will support enhancements to the CRAFT Tech unified k-ε turbulence model. The impact of employing a variable turbulent Prandtl and Schmidt number methodology, based on a two-equation scalar variance framework, will be considered for reacting and non-reacting base flows. The effort will lead to extended validation of enhanced turbulence modeling tools, increased reliability of base drag & heat flux predictions and fills a major gap at the US Army by improving upon base region simulation capabilities required for design of low altitude missiles with surface-mounted, fast-reacting jet thrusters located at the aft-end.