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
May 2009
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
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Text
separating_propagating_nonpropagating.pdf
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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
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Date deposited: 13 Jul 2009
Last modified: 13 Mar 2024 18:28
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Contributors
Author:
Samuel Sinayoko
Author:
Anurag Agarwal
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