The physics of aero-acoustics makes modeling a challenging task; pressure fluctuations produce noise, which propagates over large distances far from its source. To simulate these phenomena, it is necessary both to model the detailed fluctuating flow in the neighborhood of the sound source, and the far-field propagation effects.

The primary aim of the EU Alessia Project has been to develop software tools for the simulation of fluctuating flows, with particular focus on flow-induced acoustics. The partners in the project are CFX, Technical University of Munich, Shell, Alfa Laval, LMS and Fiat Corporate Research.