Numerical assessment of the scattering of acoustic waves by turbulent structures
Numerical assessment of the scattering of acoustic waves by turbulent structures
The scattering of harmonic sound waves by a single vortex is studied to provide some
insight into the more complex problem of sound scattering by a turbulent layer. Two
different methods are used to model the scattering by a steady vortex or by a vortex
convected in a uniform mean flow. The first method is based on the linearized Euler
equations in the frequency domain and is used to study the scattering by a steady vortex.
The speed of this method allows to perform a study of the spatial scattering of a plane
wave over a wide range of frequencies, where analytical models previously developed are
restricted either to low or high frequencies. The second method uses a finite difference
solver, also based on the linearized Euler equations but in the time domain. This method
is used to study the scattering by a vortex convected in a uniform mean fow, where a
spectral scattering occurs in addition to the spatial scattering. A parametric study is
realized, focusing on four parameters including the source frequency and the convection velocity. The spectra deduced from this study show a pattern similar to the haystacking
observed in existing studies of the scattering by a turbulent shear layer. Some of the trends deduced from the parametric study are also in agreement with these previous observations. Thus, the detailled study of the scattering by a single eddy is able to provide further understanding of the turbulence scattering.
Clair, V.
4fc28cab-f835-4f4e-a50d-0040865da0ff
Gabard, G.
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
June 2015
Clair, V.
4fc28cab-f835-4f4e-a50d-0040865da0ff
Gabard, G.
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Clair, V. and Gabard, G.
(2015)
Numerical assessment of the scattering of acoustic waves by turbulent structures.
21st AIAA/CEAS Aeroacoustics Conference, Dallas, United States.
22 - 25 Jun 2015.
23 pp
.
(doi:10.2514/6.2015-2680).
Record type:
Conference or Workshop Item
(Paper)
Abstract
The scattering of harmonic sound waves by a single vortex is studied to provide some
insight into the more complex problem of sound scattering by a turbulent layer. Two
different methods are used to model the scattering by a steady vortex or by a vortex
convected in a uniform mean flow. The first method is based on the linearized Euler
equations in the frequency domain and is used to study the scattering by a steady vortex.
The speed of this method allows to perform a study of the spatial scattering of a plane
wave over a wide range of frequencies, where analytical models previously developed are
restricted either to low or high frequencies. The second method uses a finite difference
solver, also based on the linearized Euler equations but in the time domain. This method
is used to study the scattering by a vortex convected in a uniform mean fow, where a
spectral scattering occurs in addition to the spatial scattering. A parametric study is
realized, focusing on four parameters including the source frequency and the convection velocity. The spectra deduced from this study show a pattern similar to the haystacking
observed in existing studies of the scattering by a turbulent shear layer. Some of the trends deduced from the parametric study are also in agreement with these previous observations. Thus, the detailled study of the scattering by a single eddy is able to provide further understanding of the turbulence scattering.
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AIAA-2015-2680.pdf
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e-pub ahead of print date: 18 June 2015
Published date: June 2015
Venue - Dates:
21st AIAA/CEAS Aeroacoustics Conference, Dallas, United States, 2015-06-22 - 2015-06-25
Organisations:
Acoustics Group
Identifiers
Local EPrints ID: 381474
URI: http://eprints.soton.ac.uk/id/eprint/381474
PURE UUID: a682a2bb-02bc-405d-b275-c04364c69e4c
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Date deposited: 07 Oct 2015 13:56
Last modified: 14 Mar 2024 21:16
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Author:
V. Clair
Author:
G. Gabard
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