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The effect of the cleaning and repainting on ship drag penalty

The effect of the cleaning and repainting on ship drag penalty
The effect of the cleaning and repainting on 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 ks = 0. 101 mm. Using the known ks 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 %ΔC¯¯¯f and total hydrodynamic resistance %ΔR¯¯¯T during operation. Here the report also discusses two recently reported empirical estimations that can estimate ks 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 %ΔC¯¯¯f.
Turbulent boundary layer, roughness estimation, ship-hull roughness, skin friction drag
0892-7014
372-386
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.
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 the cleaning and repainting on ship drag penalty. Biofouling, 37 (4), 372-386. (doi:10.1080/08927014.2021.1914599).

Record type: Article

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 ks = 0. 101 mm. Using the known ks 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 %ΔC¯¯¯f and total hydrodynamic resistance %ΔR¯¯¯T during operation. Here the report also discusses two recently reported empirical estimations that can estimate ks 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 %ΔC¯¯¯f.

Text
Utama et al GBIF-2019-0183_7_ - Accepted Manuscript
Restricted to Repository staff only until 14 April 2022.
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More information

Accepted/In Press date: 5 April 2021
e-pub ahead of print date: 14 April 2021
Published date: 20 April 2021
Keywords: Turbulent boundary layer, roughness estimation, ship-hull roughness, skin friction drag

Identifiers

Local EPrints ID: 450071
URI: http://eprints.soton.ac.uk/id/eprint/450071
ISSN: 0892-7014
PURE UUID: e19ad9ef-c249-4402-8de2-48d701f65aa6
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 08 Jul 2021 16:31
Last modified: 26 Nov 2021 02:56

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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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