Numerical Investigations Of Aerodynamic Noise Due To Flow Past A Bluff Body

Abstract

Landing gears (LG) are primarily designed to support all the loads of an aircraft during landing, taxiing, and taking off. To ease inspection and maintenance, the aerodynamic design is not refined, where many components are exposed to the air flow generating what so-called aeroacoustics noise. To understand the underline physics and investigate both the flow field and its associated acoustic field, a two-dimensional (2D) case of flow past a circular cylinder was simulated using ANSYS Fluent. Two different Reynolds numbers, Re, 150 and 90,000 were examined. For low Re, two distinct numerical conditions steady and unsteady flow were simulated and compared to examine the effect of the time dependency on the associated acoustic field. For high Re, the acoustic field was computed using the built-in Ffowcs William and Hawkings (FW-H) acoustic analogy solver in Fluent. The results show the importance of considering the time variable to extract the corresponding flow data. The far-field noise prediction highly depends on the location of the near-filed data and its associated integral source terms (surface/volume).