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
1-18
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Wang, Yanan
efa55387-403e-4292-9001-9c9affa14d41
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
February 2020
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), , [025103].
(doi:10.1063/1.5131827).
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.
Text
Numerical investigations on the flow over cuboids with different aspect ratios and the emitted noise
- Accepted Manuscript
Available under License Other.
Text
Numerical investigations
- Version of Record
Available under License Other.
More information
Accepted/In Press date: 15 January 2020
e-pub ahead of print date: 4 February 2020
Published date: February 2020
Additional Information:
Funding Information:
This research was supported by the University of Southampton and the China Scholarship Council (CSC). The simulations in this paper were carried out on the Iridis 4 supercomputer at the University of Southampton. All data published in this paper are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D1214.
Publisher Copyright:
© 2020 Author(s).
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
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Date deposited: 11 Mar 2020 17:30
Last modified: 17 Mar 2024 05:24
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Author:
Yanan Wang
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