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Effect of ship hull form on the resistance penalty from biofouling

Artikel i vetenskaplig tidskrift
Författare Dinis Oliveira
Ann I. Larsson
Lena Granhag
Publicerad i Biofouling
Volym 34
Sidor 262-272
ISSN 08927014
Publiceringsår 2018
Publicerad vid Institutionen för marina vetenskaper
Sidor 262-272
Språk en
Länkar https://doi.org/10.1080/08927014.20...
Ämnesord frictional resistance, hull form factor, roughness, ship resistance, Turbulent boundary layer
Ämneskategorier Strömningsmekanik, Annan naturvetenskap

Sammanfattning

© 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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