Aeroacoustics
Solving the compressible Navier-Stokes equations means that acoustic waves are included in the solution (if the resolution is fine enough and if the accuracy of the numerical scheme is high enough to be able to be able to represent the high-frequency low-amplitude acoustic perturbations). This implies that one can study sound generated by the flow itself - a branch of Computational Fluid Dynamics (CFD) often referred to as Computational Aeroacoustics (CAA).