Noise Generation Analysis of a Cylindrical Cavity by LES and Global Instability

This paper is devoted to the computation of a compressible and high-Reynolds flow over a cylindrical cavity present on a flat plate. Two approaches are used : LES on one hand and linear stability analysis on the other one. The mean part of the former acts as input for the latter which consists in determining the corresponding eigenmodes. The results are compared to the unsteady part of the LES. The most amplified frequency in the LES seems to correspond to an eigenmode and a good agreement is also obtained when comparing the perturbed flow field.