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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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Abstract

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)
Additional Information: LIDO-Berichtsjahr=2001,
Title:Numerical description of acoustic sources in airframe noise
Authors:
AuthorsInstitution or Email of Authors
Delfs, J.UNSPECIFIED
Grogger, H.A.UNSPECIFIED
Lauke, T.G.W.UNSPECIFIED
Lummer, M.UNSPECIFIED
Yin, J.UNSPECIFIED
Date:2000
Status:Published
Keywords:airframe noise, perturbation, techniques, hydrodynamic instability, computational aeroacoustics
Event Title:GAMM Annual Scientific Conference, Göttingen (de), 02.-07.04.2000
Organizer:GAMM
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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