Vortex Sound Models: Passive and Active Noise Control

© 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Simple models of vortex sound, considering the motion of a line vortex past an object, have been used to determine the far-field noise due to an idealised hydrodynamic disturbance, modelling, for example, instabilities within a turbulent boundary layer. Extensions of such models to investigate devices designed for control of trailing-edge noise, both passively and actively, are proposed. This simple mathematical framework potentially gives insight into the mechanism behind experimentally observed reductions in far-field noise.