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Numerical investigations on the flow over cuboids with different aspect ratios and the emitted noise

Numerical investigations on the flow over cuboids with different aspect ratios and the emitted noise
Numerical investigations on the flow over cuboids with different aspect ratios and the emitted noise
The effect of aspect ratio on the flow over cuboids in cross-flow is investigated numerically, together with the noise emitted to the far field. The near-field flow features are obtained using the delayed detached eddy simulation approach and the far-field noise is predicted using the Ffowcs Williams–Hawkings acoustic analogy. Ten values of aspect ratio are studied in the current work ranging from 1/6 to 12 at three Reynolds numbers between 50 000 and 200 000. Aerodynamic coefficients, flow patterns, and pressure distributions along the cuboid surfaces are studied in detail with respect to cuboid aspect ratio for different Reynolds numbers. It is found that the separated flow from the leading edge reattaches to the lateral surfaces of cuboids with aspect ratios smaller than unity, while a secondary vortex is formed near the trailing edge for larger aspect ratios. In addition, the aspect ratio has considerable effect on the tonal peak in the far-field noise spectra from the cuboids occurring for aspect ratios greater than 1.
Aerodynamic noise, Aspect ratio, Flow patterns
1070-6631
1-18
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Wang, Yanan
efa55387-403e-4292-9001-9c9affa14d41
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Wang, Yanan
efa55387-403e-4292-9001-9c9affa14d41
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65

Thompson, David, Wang, Yanan and Hu, Zhiwei (2020) Numerical investigations on the flow over cuboids with different aspect ratios and the emitted noise. Physics of Fluids, 32 (2), 1-18, [025103]. (doi:10.1063/1.5131827).

Record type: Article

Abstract

The effect of aspect ratio on the flow over cuboids in cross-flow is investigated numerically, together with the noise emitted to the far field. The near-field flow features are obtained using the delayed detached eddy simulation approach and the far-field noise is predicted using the Ffowcs Williams–Hawkings acoustic analogy. Ten values of aspect ratio are studied in the current work ranging from 1/6 to 12 at three Reynolds numbers between 50 000 and 200 000. Aerodynamic coefficients, flow patterns, and pressure distributions along the cuboid surfaces are studied in detail with respect to cuboid aspect ratio for different Reynolds numbers. It is found that the separated flow from the leading edge reattaches to the lateral surfaces of cuboids with aspect ratios smaller than unity, while a secondary vortex is formed near the trailing edge for larger aspect ratios. In addition, the aspect ratio has considerable effect on the tonal peak in the far-field noise spectra from the cuboids occurring for aspect ratios greater than 1.

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Numerical investigations on the flow over cuboids with different aspect ratios and the emitted noise - Accepted Manuscript
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Accepted/In Press date: 15 January 2020
e-pub ahead of print date: 4 February 2020
Published date: February 2020
Additional Information: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.
Keywords: Aerodynamic noise, Aspect ratio, Flow patterns

Identifiers

Local EPrints ID: 438469
URI: http://eprints.soton.ac.uk/id/eprint/438469
ISSN: 1070-6631
PURE UUID: aa990d65-de08-4e27-a5fc-fdbc07e6b71e
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906

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Date deposited: 11 Mar 2020 17:30
Last modified: 28 Apr 2022 04:53

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Contributors

Author: David Thompson ORCID iD
Author: Yanan Wang
Author: Zhiwei Hu

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