Investigation on landing gear shallow round cavity flow field and noise signature

International audienceThe flow features and acoustic emission of the two-wheel simplified LAGOON landing gear shallow cavity are numerically investigated. This cavity presents several differences when compared to other academic cases, the most important one is the flow detachment occurring before the cavity edge, generating a shear layer that develops over the cavity. Despite this difference, several agreements with academic studies of round cavities have been found in terms of incoming boundary layer characteristics, detached shear layer growth, and recirculation of the flow in the cavity. Furthermore a spectral analysis of the flow identified a vortex roll-up mechanism and its associated frequency in the shear layer. Finally the far-field noise emission of the cavity has been found to be broadband with the emergence of several narrow frequency contributions whose possible mechanisms of noise generation are discussed