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Effects of cylindrical cruciform patterns on fluid flow and drag as determined by CFD models

Bi, C-W, Balash, C ORCID: 0000-0001-9514-9497, Matsubara, S ORCID: 0000-0002-5698-6687, Zhao, Y-P and Dong, G-H 2017 , 'Effects of cylindrical cruciform patterns on fluid flow and drag as determined by CFD models' , Ocean Engineering: An International Journal of Research and Development, vol. 135 , pp. 28-38 , doi: 10.1016/j.oceaneng.2017.02.032.

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Fluid flow around and drag of two cylindrical cruciform patterns, conventional (T0) and rotated 45º in its own plane (T45), were numerically investigated by solving three-dimensional Reynolds-averaged Navier-Stokes equations within the subcritical flow regime over angles of attack (AOA) from 90º to 0º. Firstly, the drag for a one-cruciform element was assessed, followed by analysis of a four-cruciform assembly (‘square mesh’) to take into account the wake effect of tandem elements. For the one-cruciform element, T45 experienced a less prominent streamline separation and consequently lower drag between 90° and 45° AOA, while T0 experienced progressively lower drag below 45° AOA owing to re-establishment of smoother streamlines caused by the gradually reduced circulation momentum from the adjacent vortex that rotates in the off-side direction. For the four-cruciform assemblies, T0 and T45 drag was essentially equal above 45º AOA; while below 45º, T45 had greater drag attributed to more prominent spanwise vortex downstream development. Overall, while the largest relative difference between the two orientations was 26.2% and 33.8% for the one- and four-cruciform configurations respectively at 0° AOA, for 30º and above AOA there were limited drag differences (generally below 10%).

Item Type: Article
Authors/Creators:Bi, C-W and Balash, C and Matsubara, S and Zhao, Y-P and Dong, G-H
Keywords: circular cylinder, cruciform, drag coefficient, T0 vs T45 mesh, wake effect
Journal or Publication Title: Ocean Engineering: An International Journal of Research and Development
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0029-8018
DOI / ID Number: 10.1016/j.oceaneng.2017.02.032
Copyright Information:

Copyright 2017 Elsevier

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