Numerical investigations on the flow over cubes with rounded corners and the noise emitted
Numerical investigations on the flow over cubes with rounded corners and the noise emitted
The effect of corner rounding on the flow past a cube is investigated numerically at different Reynolds numbers ranging from 50,000 to 200,000 using delayed detached-eddy simulation in OpenFOAM. Different corner radii from 0 to 40% of the cube length have been considered. To validate the adopted methodology, a benchmark case on the flow over a sphere with the same characteristic length is first performed. Good agreement has been achieved between the results of the benchmark and available experimental and numerical data from literature. Subsequently, features of the flow around cubes with rounded corners are investigated, including the aerodynamic coefficients, mean flow patterns and the surface pressure distribution. The relation between flow features and the aerodynamic coefficients is also analysed. In addition, the far-field noise emitted from the rounded cube is predicted using the Ffowcs William-Hawkings acoustic analogy in FLUENT. It is found that corner rounding with carefully determined radius can be an effective way to reduce the emitted noise. The minimum noise is found for a radius 1/3 of the cube side length with the lowest surface pressure fluctuations, but the sound level increases again for a further increase in corner radius to R/L = 2/5 due to vortex shedding.
Aerodynamic noise, Corner rounding, Flow patterns, cube, sphere
Wang, Yanan
1cde6df5-bf7a-43ac-9e75-7560cd7e7e3d
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
30 April 2020
Wang, Yanan
1cde6df5-bf7a-43ac-9e75-7560cd7e7e3d
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Wang, Yanan, Hu, Zhiwei and Thompson, David
(2020)
Numerical investigations on the flow over cubes with rounded corners and the noise emitted.
Computers & Fluids, 202, [104521].
(doi:10.1016/j.compfluid.2020.104521).
Abstract
The effect of corner rounding on the flow past a cube is investigated numerically at different Reynolds numbers ranging from 50,000 to 200,000 using delayed detached-eddy simulation in OpenFOAM. Different corner radii from 0 to 40% of the cube length have been considered. To validate the adopted methodology, a benchmark case on the flow over a sphere with the same characteristic length is first performed. Good agreement has been achieved between the results of the benchmark and available experimental and numerical data from literature. Subsequently, features of the flow around cubes with rounded corners are investigated, including the aerodynamic coefficients, mean flow patterns and the surface pressure distribution. The relation between flow features and the aerodynamic coefficients is also analysed. In addition, the far-field noise emitted from the rounded cube is predicted using the Ffowcs William-Hawkings acoustic analogy in FLUENT. It is found that corner rounding with carefully determined radius can be an effective way to reduce the emitted noise. The minimum noise is found for a radius 1/3 of the cube side length with the lowest surface pressure fluctuations, but the sound level increases again for a further increase in corner radius to R/L = 2/5 due to vortex shedding.
Text
Numerical investigatios on the flow over cubes with rounded corners and .._
- Accepted Manuscript
More information
Accepted/In Press date: 15 March 2020
e-pub ahead of print date: 16 March 2020
Published date: 30 April 2020
Additional Information:
Funding Information:
This research was supported by the University of Southampton and 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 theUniversity of Southampton repository at doi:10.5258/SOTON/D1276.
Publisher Copyright:
© 2020 Elsevier Ltd
Keywords:
Aerodynamic noise, Corner rounding, Flow patterns, cube, sphere
Identifiers
Local EPrints ID: 438886
URI: http://eprints.soton.ac.uk/id/eprint/438886
ISSN: 0045-7930
PURE UUID: e5935934-c079-449c-9350-4fd743bc893f
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Date deposited: 26 Mar 2020 17:30
Last modified: 23 Feb 2023 05:48
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Author:
Yanan Wang
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