Tactical Airplane Noise Reduction via Advanced Automated Computational Airframe Aft-End Integration Technologies Navy SBIR FY2014.2 Sol No.: Navy SBIR FY2014.2 Topic No.: N142-099 Topic Title: Tactical Airplane Noise Reduction via Advanced Automated Computational Airframe Aft-End Integration Technologies Proposal No.: N142-099-0418 Firm: Cascade Technologies Incorporated 2445 Faber Place #100 Palo Alto, California 94303 Contact: Guillaume Bres Phone: (650) 521-0243 Web Site: www.cascadetechnologies.com Abstract: Cascade Technologies and its collaborators from Stanford University propose to develop an efficient and robust computational framework to optimize the aerodynamic interactions between vortices shed by designed control surfaces/devices on the airframe aft-end and the engine exhaust plume, as a mechanism to appropriately modified the jet development and reduce the radiated noise, without impacting performance. In Phase I and I Option, the proposed approach will focus on geometry and operating conditions relevant to tactical aircraft, and will be carried out in three steps: first, explore with Reynolds-averaged Navier-Stokes (RANS) simulations a range of enhanced jet/airframe interaction leading to substantial modification of the jet development; Second, assess with high-fidelity large eddy simulations (LES) the effectiveness of a few selected alteration of the jet plume for noise reduction. Third, iterate on the configuration within a RANS/LES optimization framework to further enhanced the jet flow field modifications for maximum noise mitigation. The specific choice, design and wind-tunnel testing of the practical devices or airframe modification necessary to achieve the optimized jet/airframe interactions would then be tackled in Phase II, in close collaboration with experimental collaborators. Benefits: Provide general framework for cost-effective LES/RANS optimization Improve design of nozzle and airframe components for noise mitigation Return