The University of Southampton
University of Southampton Institutional Repository

On separating propagating and non-propagating dynamics in fluid-flow equations

On separating propagating and non-propagating dynamics in fluid-flow equations
On separating propagating and non-propagating dynamics in fluid-flow equations
The ability to separate acoustically radiating and non-radiating components in fluid flow is desirable to identify the true sources of aerodynamic sound, which can be expressed in terms of the non-radiating flow dynamics. These non-radiating components are obtained by filtering the flow field. Two linear filtering strategies are investigated: one is based on a differential operator, the other employs convolution operations. Convolution filters are found to be superior at separating radiating and non-radiating components. Their ability to decompose the flow into non-radiating and radiating components is demonstrated on two different flows: one satisfying the linearized Euler and the other the Navier-Stokes equations. In the latter case, the corresponding sound sources are computed. These sources provide good insight into the sound generation process. For source localization, they are found to be superior to the commonly used sound sources computed using the steady part of the flow.
true sources of sound, aeroacoustics, non-propagating dynamics, flow filtering
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Sinayoko, Samuel
0e4346ca-1a26-481d-8241-f83730f6b0e4
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65

Sinayoko, Samuel, Agarwal, Anurag and Hu, Zhiwei (2009) On separating propagating and non-propagating dynamics in fluid-flow equations. 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), Miami, USA. 11 - 13 May 2009. 12 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The ability to separate acoustically radiating and non-radiating components in fluid flow is desirable to identify the true sources of aerodynamic sound, which can be expressed in terms of the non-radiating flow dynamics. These non-radiating components are obtained by filtering the flow field. Two linear filtering strategies are investigated: one is based on a differential operator, the other employs convolution operations. Convolution filters are found to be superior at separating radiating and non-radiating components. Their ability to decompose the flow into non-radiating and radiating components is demonstrated on two different flows: one satisfying the linearized Euler and the other the Navier-Stokes equations. In the latter case, the corresponding sound sources are computed. These sources provide good insight into the sound generation process. For source localization, they are found to be superior to the commonly used sound sources computed using the steady part of the flow.

Text
separating_radiating_nonradiating_presentation_handout.pdf - Other
Download (3MB)
Text
separating_propagating_nonpropagating.pdf - Other
Download (419kB)

More information

Published date: May 2009
Venue - Dates: 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), Miami, USA, 2009-05-11 - 2009-05-13
Keywords: true sources of sound, aeroacoustics, non-propagating dynamics, flow filtering

Identifiers

Local EPrints ID: 66671
URI: http://eprints.soton.ac.uk/id/eprint/66671
PURE UUID: c7d334a1-e258-4796-8e44-304a0157517b

Catalogue record

Date deposited: 13 Jul 2009
Last modified: 13 Mar 2024 18:28

Export record

Contributors

Author: Samuel Sinayoko
Author: Anurag Agarwal
Author: Zhiwei Hu

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 http://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.

×