Airframe Noise Simulation of an A320 in Landing Configuration

The high-lift system noise is predicted for a landing approach condition for the actual scale Airbus 320-232 ``D-ATRA'' research aircraft of DLR. Noise simulations are performed for all key elements of the high-lift wing using stochastically derived sources, based on the underlying one-off Reynolds-averaged Navier-Stokes CFD simulation. Turbulence quantities that are essential for the acoustic source characterisation are derived from the CFD solution by means of eddy-viscosity. The acoustic perturbation equations (APE) are solved using a volume-resolving discontinuous Galerkin method valid in a non-uniform medium, assuming uncorrelated source domains. Then, the acoustic data are collected on a permeable Ffowcs Williams and Hawkings (FWH) surface and integrated to a far-field, where the acoustic pressures from different sources are combined for obtaining the overall noise footprint. The aeroacoustic simulation is compared to fly-over measurements in a blind test setting. A very good agreement is reported for the absolute sound pressure level (OASPL) predictions.