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Effect of ship hull form on the resistance penalty from biofouling

Journal article
Authors Dinis Oliveira
Ann I. Larsson
Lena Granhag
Published in Biofouling
Volume 34
Pages 262-272
ISSN 08927014
Publication year 2018
Published at Department of marine sciences
Pages 262-272
Language en
Links https://doi.org/10.1080/08927014.20...
Keywords frictional resistance, hull form factor, roughness, ship resistance, Turbulent boundary layer
Subject categories Fluid mechanics, Other Natural Sciences

Abstract

© 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. Hull biofouling is a well-known problem for the shipping industry, leading to increased resistance and fuel consumption. Considering that the effects of hull form on resistance are known to be higher for a less slender hull, it is hypothesised in this paper that the effect of biofouling roughness on resistance is also dependent on the hull form. To test this hypothesis, previously reported full-scale numerical results on a containership are re-analysed. Form effects on roughness penalties, corresponding to K ΔCT  = 0.058 ± 0.025, are observed at a low speed (19 knots, Re s  = 2.29 × 10 9 ), which are however cancelled out by traditionally neglected roughness effects on wave-making resistance at a higher speed (24 knots, Re s  = 2.89 × 10 9 ). It is concluded that hull form effects on biofouling penalties can be significant at low speeds, though not generalisable for higher speeds, namely when wave-making resistance corresponds to ≥ 29% of total resistance.

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