Title: A computational methodology for the acoustic characterization of orifices under grazing flow conditions
Authors: Toulorge, Thomas ×
De Roeck, Wim
Denayer, Hervé
Desmet, Wim #
Issue Date: 2017
Publisher: Academic Press
Series Title: Journal of Sound and Vibration issue:submitted
Abstract: This paper deals with the numerical prediction of the aeroacoustic behavior of orifices under grazing flow conditions. A hybrid computational aeroacoustics approach is adopted where the steady, incompressible, mean flow over the orifice is obtained from a Reynolds–Averaged Navier–Stokes (RANS) simulation. In a next step, the mean flow variables are used to solve the linearized Navier–Stokes equations, using a Runge–Kutta Discontinuous Galerkin method. In this way, the linear interaction mechanisms between the aerodynamic and acoustic fluctuations are studied which enables an aeroacoustic characterization of the orifice. A methodology is presented involving a virtual impedance tube and two computations for each geometrical configuration: one with the presence of a mean flow and one for a quiescent medium. This allows to isolate the contribution of the mean flow to the orifice impedance. The method is verified against theoretical models and experimental data from literature, and is used to study the influence of orifice geometry variations, such as the orifice length, the plate thickness and the edge rounding, on the mean flow
contribution to the impedance.
ISSN: 0022-460X
Publication status: submitted
KU Leuven publication type: IT
Appears in Collections:Production Engineering, Machine Design and Automation (PMA) Section
Mechanical Engineering Technology TC, Campus Group T Leuven
Technologiecluster Werktuigkundige Industriële Ingenieurstechnieken
× corresponding author
# (joint) last author

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