The effect of flow stratification on ship performance: a numerical study
The effect of flow stratification on ship performance: a numerical study
If a layer of low-density water settles on top of higher density water, such as fresh water melting from a glacier and settling on top of colder seawater, a body of water can stratify into stable, distinct layers. A vessel advancing in such a stratified fluid can generate internal waves between these layers. The generation of internal waves requires energy and thus increases the resistance experienced by the vessel, a phenomenon known as the dead water effect which can result in a severe reduction in speed and loss of steering power. This study uses Computational Fluid Dynamics (CFD) to investigate the increase in ship resistance caused by the dead water effect. The results show that the presence of a stratified flow can increase total resistance approximately sixfold in extreme conditions. At standard operating conditions, total resistance may increase by approximately 6% as a result of flow stratification.
URANS, dead water, flow stratification, ship resistance, CFD
Reid, Patrick
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Terziev, Momchil
938f71d0-02b5-414c-8c2d-9cca8cc87397
Tezdogan, Tahsin
7e7328e2-4185-4052-8e9a-53fd81c98909
Incecik, Atilla
25a12ee2-7ba6-47cf-af5d-a79de4c6a2c4
22 February 2024
Reid, Patrick
d323a038-9556-425a-8e57-faed0e9d724a
Terziev, Momchil
938f71d0-02b5-414c-8c2d-9cca8cc87397
Tezdogan, Tahsin
7e7328e2-4185-4052-8e9a-53fd81c98909
Incecik, Atilla
25a12ee2-7ba6-47cf-af5d-a79de4c6a2c4
Reid, Patrick, Terziev, Momchil, Tezdogan, Tahsin and Incecik, Atilla
(2024)
The effect of flow stratification on ship performance: a numerical study.
Ships and Offshore Structures.
(doi:10.1080/17445302.2024.2312729).
Abstract
If a layer of low-density water settles on top of higher density water, such as fresh water melting from a glacier and settling on top of colder seawater, a body of water can stratify into stable, distinct layers. A vessel advancing in such a stratified fluid can generate internal waves between these layers. The generation of internal waves requires energy and thus increases the resistance experienced by the vessel, a phenomenon known as the dead water effect which can result in a severe reduction in speed and loss of steering power. This study uses Computational Fluid Dynamics (CFD) to investigate the increase in ship resistance caused by the dead water effect. The results show that the presence of a stratified flow can increase total resistance approximately sixfold in extreme conditions. At standard operating conditions, total resistance may increase by approximately 6% as a result of flow stratification.
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The effect of flow stratification on ship performance a numerical study
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Accepted/In Press date: 3 November 2023
e-pub ahead of print date: 22 February 2024
Published date: 22 February 2024
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© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Keywords:
URANS, dead water, flow stratification, ship resistance, CFD
Identifiers
Local EPrints ID: 484124
URI: http://eprints.soton.ac.uk/id/eprint/484124
ISSN: 1744-5302
PURE UUID: dca97ff1-393c-4503-ae4b-021f6d9305ea
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Date deposited: 10 Nov 2023 17:55
Last modified: 20 Apr 2024 02:45
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Author:
Patrick Reid
Author:
Momchil Terziev
Author:
Tahsin Tezdogan
Author:
Atilla Incecik
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