Downstream subsonic jet noise: link with vortical structures intruding into the jet core

computed by a compressible Large Eddy Simulation (LES) to determine both the flow field and the sound field in the same calculation. The noise radiated by the jet, provided by LES, is in good agreement with experimental data of the literature in terms of sound pressure spectra, levels and directivity, showing the feasibility of this direct noise calculation. The dominant sound generation mechanism is also investigated, by presenting a correlation between its radiation, observed for an angle of 30 ◦ from the downstream direction, and the intrusion of vortical structures into the jet core. To cite this article: C. Bogey