AeroacousticEvaluation of a Simplified Weapon Bay under Transonic Conditions with Doors Oriented at Various Locations

Abstract

In this paper,a simplifiedtransonic weapon baywith a L/D=5 and Mach number 0.85 was considered using the large-eddy simulation(LES)with dynamic kinetic energy subgrid-scale (SGS)model. The M219 geometry has been analyzed using OpenFOAM for three different configurations based on the position of the covers. The obtained results have been validated against reference studies and presented in terms of mean streamwise velocity profile, overall sound pressure level, sound pressure level and band-integrated sound pressure level in both spatial and frequency domains. In order to mitigate the high computational cost associated with acoustic analysis, a Cartesian mesh topology has been employed as an alternative approach. The numerical findings have demonstrated a comparable level of accuracy to simulations conducted with high-cell count meshes. Based on these findings, a cavity analysis has been conducted for the configuration with covers positioned at a position of 45°.

Keywords

• cavity flow
• weapon bay
• compressible flow
• aeroacoustics
• openfoam