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Aspects of numerically solving Euler's equations for aeroacoustic problems

Delfs, J. (1999) Aspects of numerically solving Euler's equations for aeroacoustic problems. Vortrag Institut Henri Poincaré, Paris (fr), 10.-11-06.1999.

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Abstract

The main topic of the presentation is the discussion of various numerical difficulties associated with solving Euler's equations numerically in order to compute aerodynamic noise. This concerns not only the sound propagation though generally moving media, but -even more important- also the simulation of the very noise generation. Considering modern high order, dispersion relation preserving numerical schemes for the unsteady Euler equations (CAA methods) as potential means of computing, say the interaction of vorticity with geometric inhomogeneities, and thus the noise generation directly, also implies certain fundamental difficulties. These arise, unavoidably by e.g. introducing artificial selective damping into the numerical representation of the equations. But also other potential pitfalls in an Euler simulation of a noise generation process are discussed as well as possible work-arounds. The presentation shows examples of "artificial noise generation" and "physical noise generation", both computed numerically by solving Euler's equations. an attempt is made to estimate the "signal to (numerical) noise ratio" in an acoustic simulation.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Aspects of numerically solving Euler's equations for aeroacoustic problems
Authors:
AuthorsInstitution or Email of Authors
Delfs, J.UNSPECIFIED
Date:1999
Status:Published
Keywords:Computational aeroacoustics, CAA, artificial selective damping, edge noise mechanism, airframe noise, turbulence noise, Euler equations, contact discontinuities, signal-to-numerical-noise ratio
Event Title:Vortrag Institut Henri Poincaré, Paris (fr), 10.-11-06.1999
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: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:08

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