The effect of cleaning and repainting on the ship drag penalty
The effect of cleaning and repainting on the ship drag penalty
Although the hull of a recently dry-docked large ship is expected to be relatively smooth, surface scanning and experimentation reveal that it can exhibit an “orange-peel” roughness pattern with an equivalent sand-grain roughness height (Formula presented.) = 0. 101mm. Using the known (Formula presented.) value and integral boundary layer evolution, a recently cleaned and coated full-scale ship was predicted to experience a significant increase in the average coefficient of friction (Formula presented.) and total hydrodynamic resistance (Formula presented.) during operation. Here the report also discusses two recently reported empirical estimations that can estimate k
s directly from measured surface topographical parameters, by-passing the need for experiments on replicated surfaces. The empirical estimations are found to have an accuracy of 4.5 − 5 percentage points in (Formula presented.).
Turbulent boundary layer, roughness estimation, ship-hull roughness, skin friction drag
372-386
Utama, I.K.A.P.
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Nugroho, Bagus
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Yusuf, M
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Prasetyo, F A
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Hakim, M.L.
bb41938a-dc30-4fe8-8c43-d835fec8601c
Suastika, I K
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Ganapathisubramani, Bharathram
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Hutchins, N.
28046228-1b0a-45ab-97ff-dfec82afe47d
Monty, Jason P.
cb3280ee-a7f3-4545-8bcb-c2ce416dce42
1 July 2021
Utama, I.K.A.P.
0449bcc4-a91f-46d8-b337-5885d64d01fe
Nugroho, Bagus
312aeeae-cbdd-4f94-ae46-e5591a7777db
Yusuf, M
4f321967-e868-4db7-8c5b-38a9ffc0cc58
Prasetyo, F A
fa88f1f5-3c5c-4870-bebf-fa4d6d887991
Hakim, M.L.
bb41938a-dc30-4fe8-8c43-d835fec8601c
Suastika, I K
cac63960-3456-48ea-a9f1-5c9bd4295969
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Hutchins, N.
28046228-1b0a-45ab-97ff-dfec82afe47d
Monty, Jason P.
cb3280ee-a7f3-4545-8bcb-c2ce416dce42
Utama, I.K.A.P., Nugroho, Bagus, Yusuf, M, Prasetyo, F A, Hakim, M.L., Suastika, I K, Ganapathisubramani, Bharathram, Hutchins, N. and Monty, Jason P.
(2021)
The effect of cleaning and repainting on the ship drag penalty.
Biofouling, 37 (4), .
(doi:10.1080/08927014.2021.1914599).
Abstract
Although the hull of a recently dry-docked large ship is expected to be relatively smooth, surface scanning and experimentation reveal that it can exhibit an “orange-peel” roughness pattern with an equivalent sand-grain roughness height (Formula presented.) = 0. 101mm. Using the known (Formula presented.) value and integral boundary layer evolution, a recently cleaned and coated full-scale ship was predicted to experience a significant increase in the average coefficient of friction (Formula presented.) and total hydrodynamic resistance (Formula presented.) during operation. Here the report also discusses two recently reported empirical estimations that can estimate k
s directly from measured surface topographical parameters, by-passing the need for experiments on replicated surfaces. The empirical estimations are found to have an accuracy of 4.5 − 5 percentage points in (Formula presented.).
Text
Utama et al GBIF-2019-0183_7_
- Accepted Manuscript
More information
Accepted/In Press date: 5 April 2021
e-pub ahead of print date: 14 April 2021
Published date: 1 July 2021
Additional Information:
Funding Information:
The authors would like to thank the Australian Research Council and the Newton Fund for the support of this work. B. Ganapathisubramani is grateful to EPSRC for their support through grant EP/P009638/1. I K A P Utama acknowledges the support from the Ministry of Research, Technology and Higher Education of the Republic of Indonesia under the World Class Professor 2019 Grant scheme: T/42/D2.3/KK.04.05/2019. The authors thank PT Dharma Lautan Utama for providing access to the Dharma Kencana IX ferry, Dr Marcus Tullberg of Hempel A/S for his assistance in obtaining the hull roughness imprint, and PT Biro Klasifikasi Indonesia for ensuring the safety of the research team. This paper uses re-analysis data from Nugroho et al. (2021) and they are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D1559.
Publisher Copyright:
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
Keywords:
Turbulent boundary layer, roughness estimation, ship-hull roughness, skin friction drag
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Local EPrints ID: 450071
URI: http://eprints.soton.ac.uk/id/eprint/450071
ISSN: 0892-7014
PURE UUID: e19ad9ef-c249-4402-8de2-48d701f65aa6
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Date deposited: 08 Jul 2021 16:31
Last modified: 17 Mar 2024 06:30
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Contributors
Author:
I.K.A.P. Utama
Author:
Bagus Nugroho
Author:
M Yusuf
Author:
F A Prasetyo
Author:
M.L. Hakim
Author:
I K Suastika
Author:
N. Hutchins
Author:
Jason P. Monty
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