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# Effect of turbulence modelling on 3-D LES of transitional flow behind a circular cylinder

Kim, Sunghan, Wilson, Philip A. and Chen, Zhi-Min (2015) Effect of turbulence modelling on 3-D LES of transitional flow behind a circular cylinder. Ocean Engineering, 100, 19-25.

Record type: Article

## Abstract

Results of a numerical evaluation of transitional flow behind a circular cylinder are presented. Three-dimensional calculations are performed in a frame of large eddy simulation at a Reynolds number of 41300 based on the free stream velocity and cylinder diameter for which previous experimental data is available for comparison. The flow in the transitional regime is characterized by the presence of multiple flow scales such as small-scale shear-layer vortices in freely separating boundary layers and large-scale vortex motion in the wake. Three different subgrid scales, namely the Smagorinsky, $k$-equation and dynamic $k$-equation models, are applied in order to evaluate such a challenging flow field at the higher Reynolds number. The effects of the subgrid scale modelling on the main wake parameters and mean flow statistics are discussed in detail and compared to available experimental measurement for the challenging flow regime.

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Submitted date: 15 October 2014
Accepted/In Press date: 12 February 2015
Published date: 9 April 2015
Keywords: LES, Turbulence modelling, Circular cylinder, Near-wake flow
Organisations: Fluid Structure Interactions Group

## Identifiers

Local EPrints ID: 374510
URI: http://eprints.soton.ac.uk/id/eprint/374510
ISSN: 0029-8018
ORCID for Philip A. Wilson: orcid.org/0000-0002-6939-682X

## Catalogue record

Date deposited: 19 Feb 2015 13:41

## Contributors

Author: Sunghan Kim
Author: Zhi-Min Chen