Vortex sound from rigid disk motion

A combined theoretical-experimental campaign is organized to predict and provide preliminary validation of the sound generated by a rigid disk oscillating in a quiescent fluid. The mathematical model focuses on two distinct sound production mechanisms: (1) the radiation of unsteady pressure on the disk due to prescribed harmonic motions; and (2) the interaction of the disk with the vortex flow structures it produces. New modeling for the latter noise mechanism seeks to identify the relevant parametric groups and asymptotic scaling behaviors of sound generated by vortex ring creation. This information will guide the design of an initial experimental validation of the acoustic field with the anechoic facilities at Virginia Tech. Results from this effort are expected to establish a technical baseline to examine the role of vorticity generation in the noise produced by thin vibrating bodies and to motivate strategies to mitigate or enhance flow-noise production.