Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces. Noise generation can also be associated with periodically varying flows.

What is Lighthill equation?

Lighthill's equation is used to compute the noise pro- duced by subsonic flows. ... The source terms are evaluated from the unsteady compress- ible flow motion equations, which provide also a refer- ence sound field. By this way, all mean flow - sound waves interactions are included into the source terms.

What is Lighthill acoustic analogy?

Lighthill (1952) used the same idea to develop his acoustic analogy in which the equations of fluid motion, expressing conservation of mass and momentum, are combined to yield a linear wave equation with nonlinear forcing terms. In both cases, the 'base flow' is a uniform fluid at rest.