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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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)|
|Title:||Aspects of numerically solving Euler's equations for aeroacoustic problems|
|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|
|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:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 20:08|
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