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Prediction of noise from interaction of vorticity with airfoils using CAA

Yin, J. and Delfs, J.W. and Grogger, H.A. and Lauke, T.G.W. and Lummer, M. (2000) Prediction of noise from interaction of vorticity with airfoils using CAA. In: 7th International Congress on Sound and Vibration, Vol. 3, pp. 1371-1378. 7th International Congress on Sound and Vibration, Garmisch-Partenkirchen (de), 04.-07.07.2000.

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Abstract

The long-term objective of the research is to use computational aeroacoustics (CAA) to assess the source mechanism, generation and propagation of airframe noise. As one step towards this purpose, the noise which is caused by the interaction of vorticity waves with the leading edge of real airfoils is simulated using CAA. The perturbation equations about the mean flow are used as governing equations in solving this problem. In order to create accurate results and keep a minimum number of grid points, a non-uniform grid system is used in which local resolution enhancement is achieved by stepping the grid size of neighboring grid blocks by factors of two. In the area of two Cartesian grid interfaces, a combination of Tam & Webb's DRP and Lele's cell-centred high order differencing scheme are implemented. A direct Cartesian boundary treatment of curved-wall is implemented. Joukowski airfoils with different thickness are chosen in the simulation. The influence of the airfoil thickness and the airfoil profile on radiated noise is described.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2001,
Title:Prediction of noise from interaction of vorticity with airfoils using CAA
Authors:
AuthorsInstitution or Email of Authors
Yin, J.UNSPECIFIED
Delfs, J.W.UNSPECIFIED
Grogger, H.A.UNSPECIFIED
Lauke, T.G.W.UNSPECIFIED
Lummer, M.UNSPECIFIED
Date:2000
Journal or Publication Title:7th International Congress on Sound and Vibration
Volume:Vol. 3
Page Range:pp. 1371-1378
Status:Published
Keywords:computational aeroacoustics (CAA), airframe noise, airfoil vorticity interaction, high order interface treatment, cartesian boundary treatment
Event Title:7th International Congress on Sound and Vibration, Garmisch-Partenkirchen (de), 04.-07.07.2000
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: Claudia Grant
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:14

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