High-fidelity internal flow modeling for integrated nozzle-plume jet noise simulation

Spectral Energies, LLC and The Ohio State University proposes a comprehensive research effort to advance the state-of-the-art in seamless computation of the interior of a nozzle in high performance turbine exhaust and downstream plume aerodynamics. The focus is on higher-fidelity methods using robust, efficient and scalable high-order accurate implicit schemes couched in a Large-Eddy Simulation (LES) framework. Phase I will develop and demonstrate the existing procedure on a government-furnished geometry, uniting the nozzle interior and jet into a single simulation. We then propose physically consistent methods to introduce incoming turbulence (in the freestream as well as the boundary layer), swirl associated with upstream components and roughness of the nozzle wall due to surface finish and discrete imperfections. The method will be able to treat contoured as well as military type axisymmetric and non-axisymmetric nozzles operating at design and off-design conditions. The work plan includes a systematic sequence of steps to verify and validate each element of the method, setting the stage for a potential Phase II in which we will introduce an experimental component for detailed validation. The effort will demonstrate application to a series of nozzle designs provided by the government and transition the beta version of the developed software to NAVAIR Propulsion and Power.