Finite element simulation of noise radiation through shear layers
Finite element simulation of noise radiation through shear layers
Predicting sound propagation through the jet exhaust of an aero-engine presents the specific difficulty of representing the refraction effect of the mean flow shear. This is described in full in the linearised Euler equations but this model remains rather expensive to solve numerically. The other model commonly used in industry, the linearised potential theory, is faster to solve but needs to be modified to represent a shear layer. This paper presents a way to describe a vortex sheet in a finite element model based on the linearised potential theory. The key issues to address are the continuity of pressure and displacement that have to be enforced across the vortex sheet, as well as the implementation of the Kutta condition at the nozzle lip. Validation results are presented by comparison with analytical results. It is shown that the discretization of the continuity conditions is crucial to obtain a robust and accurate numerical model.
Prinn, Albert
002e8d99-00a1-487e-a8ec-510c9f703a5b
Gabard, Gwenael
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Beriot, Hadrien
af5a12ac-8347-48b9-9e15-9319a59163a9
April 2012
Prinn, Albert
002e8d99-00a1-487e-a8ec-510c9f703a5b
Gabard, Gwenael
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Beriot, Hadrien
af5a12ac-8347-48b9-9e15-9319a59163a9
Prinn, Albert, Gabard, Gwenael and Beriot, Hadrien
(2012)
Finite element simulation of noise radiation through shear layers.
Acoustics 2012 Nantes Conference, Nantes, France.
23 - 27 Apr 2012.
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Conference or Workshop Item
(Paper)
Abstract
Predicting sound propagation through the jet exhaust of an aero-engine presents the specific difficulty of representing the refraction effect of the mean flow shear. This is described in full in the linearised Euler equations but this model remains rather expensive to solve numerically. The other model commonly used in industry, the linearised potential theory, is faster to solve but needs to be modified to represent a shear layer. This paper presents a way to describe a vortex sheet in a finite element model based on the linearised potential theory. The key issues to address are the continuity of pressure and displacement that have to be enforced across the vortex sheet, as well as the implementation of the Kutta condition at the nozzle lip. Validation results are presented by comparison with analytical results. It is shown that the discretization of the continuity conditions is crucial to obtain a robust and accurate numerical model.
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hal-00810548.pdf
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Published date: April 2012
Venue - Dates:
Acoustics 2012 Nantes Conference, Nantes, France, 2012-04-23 - 2012-04-27
Organisations:
Acoustics Group
Identifiers
Local EPrints ID: 372187
URI: http://eprints.soton.ac.uk/id/eprint/372187
PURE UUID: af139bb5-9d95-4972-82a2-d38869c68351
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Date deposited: 03 Dec 2014 10:01
Last modified: 14 Mar 2024 18:33
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Contributors
Author:
Albert Prinn
Author:
Gwenael Gabard
Author:
Hadrien Beriot
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