Abstract
The far-field noise produced by a Rudimentary Landing Gear (RLG) was investigated using Delayed Detached Eddy Simulation (DDES) coupled with a Ffowcs-Williams Hawkings (FWH) integral. Computational results are presented for the RLG geometry using three unstructured grids of quasi-nested refinement. The geometry consists of a square post attached to an axle supporting four wheels, which is entirely suspended from an inviscid flat plate. The Reynolds number was fixed at 106 based on the wheel diameter and freestream properties. The freestream Mach number was fixed at 0.115. The effect of grid resolution using a low dissipation scheme is examined in terms of both aerodynamic forces as well as acoustic spectra. Flow visualizations reveal rich three-dimensional unsteady content and the pattern of wall-pressure fluctuations are consistent with experimental observations. In general the FWH equation predictions of the far-field noise are in very good agreement with acoustic microphone measurements. From these preliminary results it appears that DDES has the potential to become a viable tool for evaluating low noise gear designs during the early design phases before wind tunnel and flight testing have commenced. Efforts are underway to extend the approach to more complex landing gear geometries.
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