Modeling of interior nozzle flows for transient effects, realistic high performance nozzle physics and coupling to Large Eddy Simulation modeling of the jet plumes Navy SBIR FY2013.2 Sol No.: Navy SBIR FY2013.2 Topic No.: N132-102 Topic Title: Modeling of interior nozzle flows for transient effects, realistic high performance nozzle physics and coupling to Large Eddy Simulation modeling of the jet plumes Proposal No.: N132-102-0243 Firm: Cascade Technologies Incorporated 2445 Faber Place #100 Palo Alto, California 94303 Contact: Hung Le Phone: (650) 521-0243 Web Site: www.cascadetechnologies.com Abstract: The objective of the present proposal is to develop and apply accurate, robust and cost-effective methodologies for the prediction of the interior nozzle flow, seamlessly coupled with high-fidelity large eddy simulation (LES) for the prediction of the jet plume and radiated noise. The simulations will be performed in the massively-parallel unstructured LES framework developed at Cascade Technologies, using our flagship compressible solver "Charles". In Phase I and I option, the proposed tasks focuses on near-wall adaptive mesh refinement, synthetic inflow turbulence and wall modeling inside the nozzle. In particular, the wall model will significantly reduce the computational cost by relaxing the grid resolution requirements in near-wall region inside the nozzle. In addition, physics-based mesh refinement and adaptation will be implemented. This automatic meshing approach has the potential to not only greatly simplify the meshing process and drastically reduce the burden on users, but also to improve accuracy while reducing the simulation run time. The impact of these additional modelings on the predictive capability of LES must be characterized and best practices must be developed. This proposal describes a scope of work that includes development, implementation and testing of these capabilities for complex jet configurations relevant to the Navy. Benefits: 1) Effectively model interior nozzle flows, seamlessly coupled with high-fidelity LES of the jet plumes. 2) Provide novel wall-model capability to apply LES to external turbulent flows, e.g., race cars, multi-element airfoil 3) Provide physics-based grid adaptation for automatic enhanced meshing, valuable for all LES applications Return