Sound Generated by an Unsteady Flow Field, Using a Hybrid Method.

Authors: Mihaescu, M, Fuchs, L.F.
Document Type: Article
Pubstate: Published
Journal: Springer-Verlag, ISBN 3-540-22031-3.
Volume: Modeling Fluid Flow-The State of the Art.   169-178
Year: 2004


The compressible Navier-Stokes equations describe both flow field as well as sound generation. The classical acoustic theory uses the hypothesis that the part of the flow field, which is the source of the acoustic field, has distinct scales so that the acoustic waves do not interfere with the flow. Thus, the velocity vector, the pressure and the density are split into semi-compressible components and an inviscid, irrotational acoustical components. The paper includes the details of the coupling between the turbulent flow (based on Large Eddy Simulation) and the acoustical part (based on Lighthill's acoustic analogy). The approach is applied to the acoustics of a non-isothermal jet.