LAGOON: New Mach Landing Gear Noise Computation and further analysis of the CAA process

The LAGOON program currently supported by Airbus Operation SAS and involving ONERA and DLR (the French and German national aerospace research centres) and Southampton University, focus on the validation of aeroacoustics numerical tools for landing gear applications. An experimental aeroacoustic program have been performed in ONERA’s aerodynamic and anechoic windtunnels F2 and CEPRA19 with a generic landing gear configuration. The present work follows the previous CFD/CAA coupling of the baseline landing gear model configuration at Mach number M = 0.23. Using the same computational process but run at a Mach number M = 0.18, CFD is achieved with Zonal-Detached Eddy Simulation (ZDES) using ONERA’s code elsA and provides the data for the FfowcsWilliams and Hawkings surface integral methods (Onera’s code KIM). Both solid and porous surfaces are used and compared to experiment. In addition, the errors probably induced by the acoustic reflections on the CFD floor and the wake impinging the porous surfaces are studied. These errors are found to be minimal in the upstream direction where the porous surface results are in best agreement with experiment. In all directions, the solid surface results are in good agreement with experiment, predicting an overall sound pressure level with an error lower than 1.5 dB.