DNS of trailing-edge noise generated by boundary-layer instabilities

Abstract

Direct numerical simulations (DNS) are conducted of noise generated at an infinitely thin trailing edge (TE). The aim is to predict the far-field sound and the near-field hydrodynamics, providing an insight into the physical mechanisms of sound generation and potentially helping to validate acoustic theories. In particular, the DNS data are compared with Amiet's theory, where the farfield sound can be evaluated in closed form if the convecting surface pressure spectrum upstream of the TE is known. For the present investigation, Tollmien-Schlichting waves are introduced close to the inflow boundary. The disturbances propagate downstream producing pressure fluctuations at the TE. In conducting..