Aeroacoustics Acoustic measurement Aerodynamic noise Aircraft noise Boundary conditions Circles (geometry) Computational fluid dynamics Data flow analysis Duct geometry Ducted flow Ducts Flow velocity Geometry Hypersonic aircraft Jet aircraft noise Jet mixing flow Kelvin-Helmholtz instability Noise prediction (aircraft) Noise reduction Nozzle flow Rotary wing aircraft Stator blades Subsonic aircraft Supersonic aircraft Supersonic inlets Supersonic jet flow Velocity distribution Wind tunnel tests