Numerical simulation of the scattering of sound by a convected vortex

The harmonic sound field emitted by a monopole source is scattered by an inviscid vortex convected through the domain by a uniform mean flow. The scattering phenomenon is responsible for a spatial redistribution of the acoustic energy and it also alters the spectral content of the sound field. In the top frame, the colour contours represent the total pressure fluctuation. In the bottom frame, the colour contours represent the scattered pressure fluctuation (corresponding to the difference between the total pressure fluctuations obtained from simulations with and without the vortex) magnified by a factor 15. The black lines are velocity contours depicting the vortex. This simulation has been realised by V. Clair and G. Gabard at the ISVR (Institute of Sound and Vibration Research), using the solver PIANO developed by DLR (German Aerospace Research Center). This work has been carried out in the framework of a research project on the scattering of sound by turbulent flows (