The University of Southampton
University of Southampton Institutional Repository

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, 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.

Text
AIAA-2015-2680.pdf - Other
Download (5MB)

More information

e-pub ahead of print date: 18 June 2015
Published date: June 2015
Venue - Dates: 21st AIAA/CEAS Aeroacoustics Conference, United States, 2015-06-22 - 2015-06-25
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 381474
URI: https://eprints.soton.ac.uk/id/eprint/381474
PURE UUID: a682a2bb-02bc-405d-b275-c04364c69e4c

Catalogue record

Date deposited: 07 Oct 2015 13:56
Last modified: 06 Jul 2018 16:31

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×