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Span effect on the turbulence nature of flow past a circular cylinder

Span effect on the turbulence nature of flow past a circular cylinder
Span effect on the turbulence nature of flow past a circular cylinder
Turbulent flow evolution and energy cascades are significantly different in two- dimensional (2D) and three-dimensional (3D) flows. Studies have investigated these differences in obstacle-free turbulent flows, but solid boundaries have an important impact on the cross-over between 3D to 2D turbulence dynamics. In this work, we investigate the span effect on the turbulence nature of flow past a circular cylinder at Re = 10000. It is found that even for highly anisotropic geometries, 3D small-scale structures detach from the walls. Additionally, the natural large-scale rotation of the K ́arm ́an vortices rapidly two-dimensionalises those structures if the span is 50% of the diameter or less. We show this is linked to the span being shorter than the Mode B instability wavelength. The conflicting 3D small-scale structures and 2D K ́arm ́an vortices result in 2D and 3D turbulence dynamics which can coexist at certain locations of the wake depending on the domain geometric anisotropy.
0022-1120
306-323
Font Garcia, Bernat
1c605529-b50d-4703-b8cc-4ccaa5dff7fc
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Nguyen, Vihn-Tan
fc1267b4-5e09-47aa-8048-6291869f0db9
Tutty, Owen
c9ba0b98-4790-4a72-b5b7-09c1c6e20375
Font Garcia, Bernat
1c605529-b50d-4703-b8cc-4ccaa5dff7fc
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Nguyen, Vihn-Tan
fc1267b4-5e09-47aa-8048-6291869f0db9
Tutty, Owen
c9ba0b98-4790-4a72-b5b7-09c1c6e20375

Font Garcia, Bernat, Weymouth, Gabriel, Nguyen, Vihn-Tan and Tutty, Owen (2019) Span effect on the turbulence nature of flow past a circular cylinder. Journal of Fluid Mechanics, 878, 306-323. (doi:10.1017/jfm.2019.637).

Record type: Article

Abstract

Turbulent flow evolution and energy cascades are significantly different in two- dimensional (2D) and three-dimensional (3D) flows. Studies have investigated these differences in obstacle-free turbulent flows, but solid boundaries have an important impact on the cross-over between 3D to 2D turbulence dynamics. In this work, we investigate the span effect on the turbulence nature of flow past a circular cylinder at Re = 10000. It is found that even for highly anisotropic geometries, 3D small-scale structures detach from the walls. Additionally, the natural large-scale rotation of the K ́arm ́an vortices rapidly two-dimensionalises those structures if the span is 50% of the diameter or less. We show this is linked to the span being shorter than the Mode B instability wavelength. The conflicting 3D small-scale structures and 2D K ́arm ́an vortices result in 2D and 3D turbulence dynamics which can coexist at certain locations of the wake depending on the domain geometric anisotropy.

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More information

Accepted/In Press date: 15 July 2019
e-pub ahead of print date: 6 September 2019
Published date: 10 November 2019

Identifiers

Local EPrints ID: 434866
URI: http://eprints.soton.ac.uk/id/eprint/434866
ISSN: 0022-1120
PURE UUID: 37168862-e000-4a0a-af30-a9cd5bdb4e90
ORCID for Bernat Font Garcia: ORCID iD orcid.org/0000-0002-2136-3068
ORCID for Gabriel Weymouth: ORCID iD orcid.org/0000-0001-5080-5016

Catalogue record

Date deposited: 11 Oct 2019 16:30
Last modified: 26 Nov 2021 03:00

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Contributors

Author: Bernat Font Garcia ORCID iD
Author: Vihn-Tan Nguyen
Author: Owen Tutty

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