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The Aeroacoustics Branch of NASA, located at the NASA Langley Research Center (LaRC), is one branch within the NASA Langley Research Directorate. The AaB plans and conducts research aimed at understanding, predicting, and controlling the noise of air vehicles of all types in all flight regimes. The scope of the research is broad and includes fundamental, theoretical, analytical, experimental, as well as applied research in aeroacoustics. The Aeroacoustics Branch directly supports projects within the Advanced Air Vehicles Program and Integrated Aviation Systems Program of the NASA Aeronautics Research Mission Directorate. These projects are:

Research emphasis is on the fluid mechanics and acoustics of jets, nacelle and liner aeroacoustics, rotorcraft and propeller/open rotor (both single- and counter-rotation) noise, atmospheric sound propagation, and acoustic flight testing. Objectives of the research are to understand the noise generation process, to develop methods for predicting acoustics and flow fields and their interactions, and to identify and demonstrate noise reduction and control techniques. Experimental research is conducted in anechoic facilities, in laboratories, in wind tunnels, and on vehicles in flight. Current code development is based on Computational Fluid Dynamics in conjunction with the Lighthill acoustic analogy, and a new Aircraft Noise Prediction Program (ANOPP2) is under development to enable the expansion of the empirical and semi-empirical-based ANOPP to include high-fidelity, physics-based tools. The Aeroacoustics Branch uses a number of unique facilities: