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On grid concepts for Computational Aeroacoustics

Herwig A. Grogger,Jianping Yin,Jan Delfs-2000-01-01-elib (German Aerospace Center)
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TL;DRAbstract

The direct simulation of sound sources and sound fields in flows is a rapidly growing area in research of applied numerics. This particular branch of acoustics is known as Computational Aeroacoustics (CAA). the reason why CAA has been evolving so fast is twofold. Firstly, high accuracy solutions of the Euler's equations allow an adequate description of aeroacoustic source mechanisms. Secondly, CAA techniques are able to describe sound propagation through non-uniform flow fields. These two reasons distinguish CAA approaches to aeroacoustic problems from "classical" methods based on Helmholtz's wave equation, which is limited to low Mach number flows and requires the sources to be completely known in advance. At DLR, a CAA-code is under development, which will be used to predict airframe noise at high lift devices of aircraft. The source mechanism to be described numerically is the interaction of vorticity perturbations with geometric inhomogeneities and large scale hyd

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The direct simulation of sound sources and sound fields in flows is a rapidly growing area in research of applied numerics. This particular branch of acoustics is known as Computational Aeroacoustics (CAA). the reason why CAA has been evolving so fast is twofold. Firstly, high accuracy solutions of the Euler's equations allow an adequate description of aeroacoustic source mechanisms. Secondly, CAA techniques are able to describe sound propagation through non-uniform flow fields. These two reasons distinguish CAA approaches to aeroacoustic problems from "classical" methods based on Helmholtz's wave equation, which is limited to low Mach number flows and requires the sources to be completely known in advance. At DLR, a CAA-code is under development, which will be used to predict airframe noise at high lift devices of aircraft. The source mechanism to be described numerically is the interaction of vorticity perturbations with geometric inhomogeneities and large scale hyd

Keywords

Computational aeroacousticsAeroacousticsEuler equationsAcousticsGridCartesian coordinate systemMach numberComputer science

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