Aeroacoustic performance of a seal vibrissa shaped cylinder

Tom Smith; Guanjiang Chen; B. Zang

doi:10.1121/10.0020912

Aeroacoustic performance of a seal vibrissa shaped cylinder

Tom Smith^*, Guanjiang Chen, B. Zang

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

1 Citation (Scopus)

69 Downloads (Pure)

Abstract

Bio-inspired geometries have many applications in engineering, including in the field of noise control. In this work, the aeroacoustic performance of a seal vibrissa shaped cylinder (SVSC) is investigated and compared to that of a circular cylinder at Re = 37 000. Experiments conducted in an anechoic wind tunnel are compared to results from a hybrid aeroacoustic simulation with excellent agreement observed between the two. The overall sound pressure level is found to be 24.3 dB lower for the SVSC, and no prominent narrowband component is observed in the acoustic spectrum. Analysis of the flow field and surface pressure fluctuations reveals that this is because the usual large-scale alternating vortex shedding realized for bluff body flows is absent for the SVSC. Instead, smaller uncorrelated vortices are shed from the upper and lower sides of the geometry, which, when combined with a lower spanwise correlation, results in a much lower acoustic intensity spread over a broader frequency range.

Original language	English
Pages (from-to)	1585-1595
Number of pages	11
Journal	Journal of the Acoustical Society of America
Volume	154
Issue number	3
DOIs	https://doi.org/10.1121/10.0020912
Publication status	Published - 12 Sept 2023

Bibliographical note

Funding Information:
The authors wish to acknowledge the use of the University College London (UCL) Kathleen High Performance Computing Facility and associated support services in the completion of this work. The authors also acknowledge the Fluid and Aerodynamics Research Group of University of Bristol (UoB). The Ph.D. grant for G.C. is funded by the China Scholarship Council (CSC)- UoB Ph.D. scholarship.

Publisher Copyright:
© 2023 Acoustical Society of America.

Research Groups and Themes

Wind Tunnel

Keywords

Aeroacoustics
Vibrissa cylinder
Noise Control

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Accepted author manuscript, 1.54 MBLicence: CC BY

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Aerodynamic noise and its passive control of subcritical flow past a cylinder
Chen, G. (Author), Zang, B. (Supervisor) & Azarpeyvand, M. (Supervisor), 1 Oct 2024
Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)

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title = "Aeroacoustic performance of a seal vibrissa shaped cylinder",

abstract = "Bio-inspired geometries have many applications in engineering, including in the field of noise control. In this work, the aeroacoustic performance of a seal vibrissa shaped cylinder (SVSC) is investigated and compared to that of a circular cylinder at Re = 37 000. Experiments conducted in an anechoic wind tunnel are compared to results from a hybrid aeroacoustic simulation with excellent agreement observed between the two. The overall sound pressure level is found to be 24.3 dB lower for the SVSC, and no prominent narrowband component is observed in the acoustic spectrum. Analysis of the flow field and surface pressure fluctuations reveals that this is because the usual large-scale alternating vortex shedding realized for bluff body flows is absent for the SVSC. Instead, smaller uncorrelated vortices are shed from the upper and lower sides of the geometry, which, when combined with a lower spanwise correlation, results in a much lower acoustic intensity spread over a broader frequency range.",

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author = "Tom Smith and Guanjiang Chen and B. Zang",

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AU - Smith, Tom

AU - Chen, Guanjiang

AU - Zang, B.

N1 - Funding Information: The authors wish to acknowledge the use of the University College London (UCL) Kathleen High Performance Computing Facility and associated support services in the completion of this work. The authors also acknowledge the Fluid and Aerodynamics Research Group of University of Bristol (UoB). The Ph.D. grant for G.C. is funded by the China Scholarship Council (CSC)- UoB Ph.D. scholarship. Publisher Copyright: © 2023 Acoustical Society of America.

PY - 2023/9/12

Y1 - 2023/9/12

N2 - Bio-inspired geometries have many applications in engineering, including in the field of noise control. In this work, the aeroacoustic performance of a seal vibrissa shaped cylinder (SVSC) is investigated and compared to that of a circular cylinder at Re = 37 000. Experiments conducted in an anechoic wind tunnel are compared to results from a hybrid aeroacoustic simulation with excellent agreement observed between the two. The overall sound pressure level is found to be 24.3 dB lower for the SVSC, and no prominent narrowband component is observed in the acoustic spectrum. Analysis of the flow field and surface pressure fluctuations reveals that this is because the usual large-scale alternating vortex shedding realized for bluff body flows is absent for the SVSC. Instead, smaller uncorrelated vortices are shed from the upper and lower sides of the geometry, which, when combined with a lower spanwise correlation, results in a much lower acoustic intensity spread over a broader frequency range.

AB - Bio-inspired geometries have many applications in engineering, including in the field of noise control. In this work, the aeroacoustic performance of a seal vibrissa shaped cylinder (SVSC) is investigated and compared to that of a circular cylinder at Re = 37 000. Experiments conducted in an anechoic wind tunnel are compared to results from a hybrid aeroacoustic simulation with excellent agreement observed between the two. The overall sound pressure level is found to be 24.3 dB lower for the SVSC, and no prominent narrowband component is observed in the acoustic spectrum. Analysis of the flow field and surface pressure fluctuations reveals that this is because the usual large-scale alternating vortex shedding realized for bluff body flows is absent for the SVSC. Instead, smaller uncorrelated vortices are shed from the upper and lower sides of the geometry, which, when combined with a lower spanwise correlation, results in a much lower acoustic intensity spread over a broader frequency range.

KW - Aeroacoustics

KW - Vibrissa cylinder

KW - Noise Control

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DO - 10.1121/10.0020912

M3 - Article (Academic Journal)

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JO - Journal of the Acoustical Society of America

JF - Journal of the Acoustical Society of America

IS - 3

ER -

Aeroacoustic performance of a seal vibrissa shaped cylinder

Abstract

Bibliographical note

Research Groups and Themes

Keywords

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Student theses

Aerodynamic noise and its passive control of subcritical flow past a cylinder

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