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Numerical assessment of the scattering of acoustic waves by turbulent structures

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
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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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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Contributors

Author: V. Clair
Author: G. Gabard

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