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The evaluation of non-reflecting boundary conditions for duct acoustic computation

The evaluation of non-reflecting boundary conditions for duct acoustic computation
The evaluation of non-reflecting boundary conditions for duct acoustic computation
A simple method is used to quantify the performance of non-reflecting boundary conditions for duct acoustic applications. The method uses a two-dimensional wavesplitting technique to decompose the linearized Euler equations into its constitutive modes, allowing the magnitude of reflected waves from outflow boundaries to be accurately determined. Realistic conditions are simulated by conducting the boundary condition analysis using acoustic waves with characteristics often found in duct and turbomachinery problems. For this paper, the method is used to investigate the performance of three different buffer zone implementations and the Perfectly Matched Layer as non-reflecting boundary conditions. The effect of the damping properties of these boundary conditions and the incident acoustic wave characteristics on performance are considered. Results indicate that the buffer zone boundary condition using explicit damping of the solution vector after each timestep produces the best non-reflecting performance. A deterioration in performance was observed for incident waves at high angles relative to the boundary normal for all implementations.
0022-460X
539-557
Richards, S.
231c6be9-3769-47b3-ae97-06ea844e0448
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Chen, X.X.
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Richards, S.
231c6be9-3769-47b3-ae97-06ea844e0448
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Chen, X.X.
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9

Richards, S., Zhang, X., Chen, X.X. and Nelson, P.A. (2002) The evaluation of non-reflecting boundary conditions for duct acoustic computation. Journal of Sound and Vibration, 270 (3), 539-557. (doi:10.1016/j.jsv.2003.09.042).

Record type: Article

Abstract

A simple method is used to quantify the performance of non-reflecting boundary conditions for duct acoustic applications. The method uses a two-dimensional wavesplitting technique to decompose the linearized Euler equations into its constitutive modes, allowing the magnitude of reflected waves from outflow boundaries to be accurately determined. Realistic conditions are simulated by conducting the boundary condition analysis using acoustic waves with characteristics often found in duct and turbomachinery problems. For this paper, the method is used to investigate the performance of three different buffer zone implementations and the Perfectly Matched Layer as non-reflecting boundary conditions. The effect of the damping properties of these boundary conditions and the incident acoustic wave characteristics on performance are considered. Results indicate that the buffer zone boundary condition using explicit damping of the solution vector after each timestep produces the best non-reflecting performance. A deterioration in performance was observed for incident waves at high angles relative to the boundary normal for all implementations.

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More information

Published date: 2002
Additional Information: IMA Conference on Computational Aeroacoustics, London, UK, April 2002

Identifiers

Local EPrints ID: 22617
URI: http://eprints.soton.ac.uk/id/eprint/22617
ISSN: 0022-460X
PURE UUID: 3e049b9c-b4e4-4a25-8543-596e96e93e97

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Date deposited: 07 Mar 2007
Last modified: 15 Jul 2019 19:22

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Contributors

Author: S. Richards
Author: X. Zhang
Author: X.X. Chen
Author: P.A. Nelson

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