This paper presents a design modification process carried out on a real two-wheel main landing gear configuration driven by a numerical prediction of its aeroacoustic performances. Extensive flow simulations performed using the lattice Boltzmann method are used to explore a wide range of design parameters and different combinations of low-noise devices applied to the inner and outer parts of the wheels. The search of optimal configurations is supported by a deep analysis of the source mechanisms performed by combining several flow and acoustic post-processing techniques, including standard FfowcsWilliams and Hawkings, planar and stereo beam-forming computations and an analysis of the volume source terms in different frequency bands. A combined use of brake and wheel fairings leads to a noise reduction of more than 1.5 EPNdB, corresponding to a 16% reduction of the on-ground surface where the EPNL exceeds 65 EPNdB, on a fully detailed geometry.

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