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

journal contribution
posted on 2023-05-19, 16:07 authored by Bi, C-W, Balash, C, Matsubara, S, Zhao, Y-P, Dong, G-H
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%).


Publication title

Ocean Engineering: An International Journal of Research and Development








Australian Maritime College


Pergamon-Elsevier Science Ltd

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The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

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Copyright 2017 Elsevier

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Expanding knowledge in engineering

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