"Aeroacoustics is a branch of acoustics that studies noise generation via turbulent fluid motion or aerodynamic forces interacting with surfaces.  Noise genertion can also be associated with periodically varying flows.  A notable example of this phenomenom is the Aeolian tones produced by wind blowing over fixed objects.

​

Although no cmplete scientific theory of the generation of noise by aerodynamic flows has been established, most practical aeroacoustic analysis relies upon the so-called 'aeroacoustic analogy', proposed by Sir James Lighthill in the 1950's while at the University of Manchester, whereby the governing equations of motion of the fluid are coerced into a form reminiscent of the wave equeation of 'classical' (i.e. linear) acoustics in the left- hand side with the remaining terms as sources in the right-hand side." - Wikipedia