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Aerodynamic sound from a square cylinder with a downstream wedge

The effect of placing a wedge in the wake of a square cylinder (side length D) at a Reynolds number of 22,000 is numerically investigated. In particular, the effect of the wedge on aerodynamic noise is observed along with its effect on the flow field. Wedge base height (h) and its gap distance (G) d...

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Main Authors:	Samion, S. R. L., Ali, M. S. M., Abu, A., Doolan, C. J., Porteous, R. Z. Y.
Format:	Article
Published:	2016
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/68757/ https://doi.org/10.1016/j.ast.2016.03.007
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id	my.utm.68757
record_format	eprints
spelling	my.utm.687572017-11-20T08:52:16Z http://eprints.utm.my/id/eprint/68757/ Aerodynamic sound from a square cylinder with a downstream wedge Samion, S. R. L. Ali, M. S. M. Abu, A. Doolan, C. J. Porteous, R. Z. Y. T Technology (General) The effect of placing a wedge in the wake of a square cylinder (side length D) at a Reynolds number of 22,000 is numerically investigated. In particular, the effect of the wedge on aerodynamic noise is observed along with its effect on the flow field. Wedge base height (h) and its gap distance (G) downstream of the cylinder are systematically varied. Flow simulations are carried out using an unsteady RANS model employing the SST turbulence model, whereas the calculation of aerodynamic noise radiated from the flow is solved using Curle's equation. A special correction technique is applied to consider spanwise effects on noise production and validation is provided using new aeroacoustic data for a square cylinder in cross-flow. It is found that the flow behavior can be divided into two main regimes (regime I and regime II), with a linking transition regime. For regime I, the generated sound is lower than that of the isolated square cylinder case. The thinnest wedge produced the best sound reduction (11.79 dB) when the wedge is placed at . For regime II, the calculated sound level is higher than the case of an isolated square cylinder. This is because the sound emitted from both bodies have about the same magnitude and are in phase. For this case, the maximum increase of sound pressure is 6.24 dB, when the medium wedge is at . 2016 Article PeerReviewed Samion, S. R. L. and Ali, M. S. M. and Abu, A. and Doolan, C. J. and Porteous, R. Z. Y. (2016) Aerodynamic sound from a square cylinder with a downstream wedge. Aerospace Science and Technology, 53 . pp. 85-94. https://doi.org/10.1016/j.ast.2016.03.007 DOI: 10.1016/j.ast.2016.03.007
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	T Technology (General)
spellingShingle	T Technology (General) Samion, S. R. L. Ali, M. S. M. Abu, A. Doolan, C. J. Porteous, R. Z. Y. Aerodynamic sound from a square cylinder with a downstream wedge
description	The effect of placing a wedge in the wake of a square cylinder (side length D) at a Reynolds number of 22,000 is numerically investigated. In particular, the effect of the wedge on aerodynamic noise is observed along with its effect on the flow field. Wedge base height (h) and its gap distance (G) downstream of the cylinder are systematically varied. Flow simulations are carried out using an unsteady RANS model employing the SST turbulence model, whereas the calculation of aerodynamic noise radiated from the flow is solved using Curle's equation. A special correction technique is applied to consider spanwise effects on noise production and validation is provided using new aeroacoustic data for a square cylinder in cross-flow. It is found that the flow behavior can be divided into two main regimes (regime I and regime II), with a linking transition regime. For regime I, the generated sound is lower than that of the isolated square cylinder case. The thinnest wedge produced the best sound reduction (11.79 dB) when the wedge is placed at . For regime II, the calculated sound level is higher than the case of an isolated square cylinder. This is because the sound emitted from both bodies have about the same magnitude and are in phase. For this case, the maximum increase of sound pressure is 6.24 dB, when the medium wedge is at .
format	Article
author	Samion, S. R. L. Ali, M. S. M. Abu, A. Doolan, C. J. Porteous, R. Z. Y.
author_facet	Samion, S. R. L. Ali, M. S. M. Abu, A. Doolan, C. J. Porteous, R. Z. Y.
author_sort	Samion, S. R. L.
title	Aerodynamic sound from a square cylinder with a downstream wedge
title_short	Aerodynamic sound from a square cylinder with a downstream wedge
title_full	Aerodynamic sound from a square cylinder with a downstream wedge
title_fullStr	Aerodynamic sound from a square cylinder with a downstream wedge
title_full_unstemmed	Aerodynamic sound from a square cylinder with a downstream wedge
title_sort	aerodynamic sound from a square cylinder with a downstream wedge
publishDate	2016
url	http://eprints.utm.my/id/eprint/68757/ https://doi.org/10.1016/j.ast.2016.03.007
_version_	1643655970463678464
score	13.244745

Aerodynamic sound from a square cylinder with a downstream wedge

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