Modelling of flow around hexagonal and textured cylinders

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Karampour, H., Wu, Z., Lefebure, J., Jeng, D.-S., Etemad-Shahidi, A. and Simpson, B. ORCID: 0000-0002-4615-5708, 2018. Modelling of flow around hexagonal and textured cylinders. Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics, 171 (3), pp. 99-114. ISSN 1755-0777

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Official URL: https://doi.org/10.1680/jencm.17.00021

Abstract

The flow regime around a hexagonal polygon with low Reynolds numbers Re<200 is numerically investigated in two different orientations namely face-oriented and corner-oriented. The basic flow characteristics, including drag coefficient, lift coefficient, Strouhal number and critical Reynolds number of the hexagonal cylinders, are calculated using 2D transient numerical analysis. Within the studied range of Re, the predicted lift coefficient and Strouhal number of the face-oriented hexagon were higher than those of the corner-oriented hexagon. In contrast, the predicted drag coefficient and critical Reynolds number of the corner-oriented hexagon were greater than those of the face-oriented. Flow characteristics of a novel textured geometry are also studied using 3D transient analysis. The Strouhal number St of the textured geometry was found to be in between the St of both the hexagonal cylinders, and its lift coefficient is lower than that of the hexagonal cylinders.

Item Type:

Journal article

Publication Title:

Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics

Creators:

Karampour, H., Wu, Z., Lefebure, J., Jeng, D.-S., Etemad-Shahidi, A. and Simpson, B.

Publisher:

ICE Publishing

Date:

28 September 2018

Volume:

171