Title: Computational aeroacoustic characterization of different orifice geometries under grazing flow conditions
Authors: Toulorge, Thomas
De Roeck, Wim
Denayer, Hervé
Desmet, Wim
Issue Date: 17-Sep-2012
Host Document: Proceedings of the 25th Conference on Noise and Vibration Engineering (ISMA2012) vol:25 pages:617-631
Conference: Conference on Noise and Vibration Engineering (ISMA2012) edition:2012 location:Leuven, Belgium date:17-19 September 2012
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 RANS simulation. In a next step, the mean flow variables are used to solve the linearized Navier–Stokes equations (LNSE), using a Runge–Kutta Discontinuous Galerkin (RKDG) 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.
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Production Engineering, Machine Design and Automation (PMA) Section
Formerly "Departement Industriële Wetenschappen - TM M"
Mechanical Engineering Technology TC, Campus Group T Leuven
Technologiecluster Werktuigkundige Industriële Ingenieurstechnieken

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