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Sound source and pseudo-sound in the near field of a circular cylinder in subsonic conditions

Published online by Cambridge University Press:  01 June 2021

Shuai Li Open the ORCID record for Shuai Li [Opens in a new window] ,
David E. Rival Open the ORCID record for David E. Rival [Opens in a new window]  and
Xiaohua Wu Open the ORCID record for Xiaohua Wu [Opens in a new window]
Shuai Li*
Affiliation:
Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON K7L 2V9, Canada
David E. Rival
Affiliation:
Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON K7L 2V9, Canada
Xiaohua Wu
Affiliation:
Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON K7L 2V9, Canada Department of Mechanical and Aerospace Engineering, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada
*
†Email address for correspondence: shuai.li@queensu.ca
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Abstract

It is well known that the pressure fluctuations on both sides of a cylinder and those in its oscillating near-wake region are both sound sources at low Reynolds and Mach numbers. However, assessment of the propagating capacity and quantification of the radiating versus non-radiating components of these two sound sources are not currently available for this important benchmark aeroacoustic problem. Here, we isolate the radiating acoustic sound sources from the non-radiating hydrodynamic pseudo-sounds by applying the wavelet decomposition technique of Mancinelli et al. (J. Fluid Mech., vol. 813, 2017), previously used in subsonic jet-noise experiments, to decompose the cylinder near-field pressure fluctuations obtained from our direct numerical simulations. Rigorous independence and convergence analyses of the wavelet decomposition procedure are performed. It is found that the radiating acoustic component strongly dominates over the non-radiating hydrodynamic component at near-field locations above and upstream of the cylinder. In the oscillating near-wake region, the hydrodynamic component dominates over the acoustic component at most frequencies, except at the vortex shedding frequency where they exhibit comparable strengths. Furthermore, within the oscillating near-wake region, the overall sound pressure level associated with the hydrodynamic pressure fluctuations exceeds that associated with the acoustic pressure fluctuations. Away from the oscillating near-wake region, the hydrodynamic pressure fluctuations decrease dramatically while the acoustic counterparts decay slowly, demonstrating that the hydrodynamic pressure fluctuation does not propagate, and that the acoustic pressure fluctuation is the only component to propagate to the far field.

JFM classification

Acoustics: Aeroacoustics Vortex Flows: Vortex shedding Wakes/Jets: Wakes

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 919 , 25 July 2021 , A43
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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