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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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)|
|Title:||Prediction of noise from interaction of vorticity with airfoils using CAA|
|Journal or Publication Title:||7th International Congress on Sound and Vibration|
|Page Range:||pp. 1371-1378|
|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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