Numerical description of acoustic sources in airframe noise
Delfs, J. and Grogger, H.A. and Lauke, T.G.W. and Lummer, M. and Yin, J. (2000) Numerical description of acoustic sources in airframe noise. GAMM Annual Scientific Conference, Göttingen (de), 02.-07.04.2000.
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The origin of airframe noise in subsonic flows is mainly related to vorticity perturbations which i) interact with geometric inhomogeneities (edges, steps, slots), ii) are subject to strong convective accelerations of the mean flow, iii) are strongly amplified in magnitude due to hydrodynamic instability of the mean flow. Therefore, apart from an appropriate modeling of the vorticity perturbations (e.g. causal or stochastic), a suitable Computational Aeroacoustics (CAA) method needs to describe accurately the conversion process from hydrodynamic to acoustic perturbations, i.e. the very noise generation. Aeronautics-related examples of numerically simulated airframe noise phenomena are presented which were obtained using DLR's CAA-code based on the high order spatial DRP scheme of Tam&Webb, the RK4 scheme in time and perfectly matched layers at the freefield boundaries of Hu.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Numerical description of acoustic sources in airframe noise|
|Keywords:||airframe noise, perturbation, techniques, hydrodynamic instability, computational aeroacoustics|
|Event Title:||GAMM Annual Scientific Conference, Göttingen (de), 02.-07.04.2000|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L VU - Air Traffic and Environment|
|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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