Computational fluid dynamics predictions of draught and trim variations on ship resistance in confined waters
Computational fluid dynamics predictions of draught and trim variations on ship resistance in confined waters
Adjusting a vessel's trim and draught to enhance resistance characteristics is a promising strategy to improve the energy efficiency of maritime transport. However, the vast majority of scientific effort has been directed at such gains in deep, unrestricted waters. Shallow and confined waters modify the flow and pressure distribution around a ship, altering considerably the resistance curve. This study aims to elucidate trim and draught increase effects on a ship's resistance while advancing through a restricted waterway using Computational Fluid Dynamics. The results show that increasing the draught of a benchmark hull magnifies the hydrodynamic resistance by approximately 10% to 15% depending on the ship speed. This added hydrodynamic resistance may be compensated by adjusting the vessels’ trim, but the ability to compensate the added hydrodynamic resistance is sensitive to ship's speed. At low speeds, the numerical model predicts the increase in resistance due to a 10% higher draught can be reduced by varying the trim angle leaving the total resistance 0.87% higher than at the design draught and zero trim angle condition. On the other hand, higher speeds offer a greater potential for resistance reduction through trim.
CFD, Draught change, RANS, Shallow water, Trim angle
Campbell, Ruaraidh
1b70b8d2-73e7-4982-8707-16c67603fbfc
Terziev, Momchil
938f71d0-02b5-414c-8c2d-9cca8cc87397
Tezdogan, Tahsin
7e7328e2-4185-4052-8e9a-53fd81c98909
Incecik, Atilla
25a12ee2-7ba6-47cf-af5d-a79de4c6a2c4
30 September 2022
Campbell, Ruaraidh
1b70b8d2-73e7-4982-8707-16c67603fbfc
Terziev, Momchil
938f71d0-02b5-414c-8c2d-9cca8cc87397
Tezdogan, Tahsin
7e7328e2-4185-4052-8e9a-53fd81c98909
Incecik, Atilla
25a12ee2-7ba6-47cf-af5d-a79de4c6a2c4
Campbell, Ruaraidh, Terziev, Momchil, Tezdogan, Tahsin and Incecik, Atilla
(2022)
Computational fluid dynamics predictions of draught and trim variations on ship resistance in confined waters.
Applied Ocean Research, 126, [103301].
(doi:10.1016/j.apor.2022.103301).
Abstract
Adjusting a vessel's trim and draught to enhance resistance characteristics is a promising strategy to improve the energy efficiency of maritime transport. However, the vast majority of scientific effort has been directed at such gains in deep, unrestricted waters. Shallow and confined waters modify the flow and pressure distribution around a ship, altering considerably the resistance curve. This study aims to elucidate trim and draught increase effects on a ship's resistance while advancing through a restricted waterway using Computational Fluid Dynamics. The results show that increasing the draught of a benchmark hull magnifies the hydrodynamic resistance by approximately 10% to 15% depending on the ship speed. This added hydrodynamic resistance may be compensated by adjusting the vessels’ trim, but the ability to compensate the added hydrodynamic resistance is sensitive to ship's speed. At low speeds, the numerical model predicts the increase in resistance due to a 10% higher draught can be reduced by varying the trim angle leaving the total resistance 0.87% higher than at the design draught and zero trim angle condition. On the other hand, higher speeds offer a greater potential for resistance reduction through trim.
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More information
Accepted/In Press date: 26 July 2022
e-pub ahead of print date: 1 August 2022
Published date: 30 September 2022
Additional Information:
Funding Information:
Results were obtained using the ARCHIE-WeSt High Performance Computer (www.archie-west.ac.uk) based at the University of Strathclyde. Figs. 3–10 were produced using MatPlotLib, created by Cobeldick (2021). The underlying data used in the paper is openly available through the University of Strathclyde repository at: 10.15129/3b633085-7d3a-40ef-bf3f-53de0e126076
Publisher Copyright:
© 2022
Keywords:
CFD, Draught change, RANS, Shallow water, Trim angle
Identifiers
Local EPrints ID: 473862
URI: http://eprints.soton.ac.uk/id/eprint/473862
ISSN: 0141-1187
PURE UUID: 9504f48a-e5ac-4986-851c-1ddfa64fe7a3
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Date deposited: 02 Feb 2023 17:32
Last modified: 17 Mar 2024 04:18
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Contributors
Author:
Ruaraidh Campbell
Author:
Momchil Terziev
Author:
Tahsin Tezdogan
Author:
Atilla Incecik
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