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Resistance prediction of double acting tanker in ice condition

An icebreaker ship should have ice bow design at its stem part. It should have ice bow design because a common bow design has high resistance when sailing in open water. In order to solve the problem, previous researchers had introduced a Double-Acting Tanker (DAT) which is able to sail astern on se...

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Main Author: Afrizal, Efi
Format: Thesis
Language:English
Published: 2021
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/101777/1/EfiAfrizalPSKM2021.pdf
http://eprints.utm.my/id/eprint/101777/
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spelling my.utm.1017772023-07-13T01:12:47Z http://eprints.utm.my/id/eprint/101777/ Resistance prediction of double acting tanker in ice condition Afrizal, Efi TJ Mechanical engineering and machinery An icebreaker ship should have ice bow design at its stem part. It should have ice bow design because a common bow design has high resistance when sailing in open water. In order to solve the problem, previous researchers had introduced a Double-Acting Tanker (DAT) which is able to sail astern on sea surface covered by ice and sailing ahead in open water. The main problems are liaised with hull, ice, and propeller interactions during the DAT ship sailing astern which is very complex and simulation software is unable to simulate. In addition, the model scale test in the towing tank needs a full scale data of ice resistance. The aim of this work was to propose an empirical method to predict the resistance of DAT based on Koto method. The resistance components were water resistance, friction resistance, momentum resistance, immersion resistance and breaking resistance. The dimensionless constants for each resistance component were determined by using multiple regression variables. The forward sailing resistance of a DAT model was simulated at 0.4 m/s, 0.5 m/s and 0.6 m/s to predict the suction force of the propeller disc effect when DAT sailing at 1.8 m/s, 2.4 m/s and 2.7 m/s in iced sea surface condition. DAT resistance was predicted using the Finite Element Method (FEM) in Eulerian-Lagrangian Coupled theory (CEL) to detect the interactions between ship and ice sheets. The results showed that the ice sheet warms up when DAT sails forward and the ice sheet bends when DAT sails astern. The required force to break the ice sheet when sailing astern is less than the one sailing forward because of the critical bended length is shorter than normal bended length. The simulation results using the proposed empirical method show a good agreement with the experimental data. A total of 60% drag decreased when DAT sails backward. The significance of this study is the complexity of the astern sailing was explained clearly when the resistance of DAT was predicted by using empirical method. 2021 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/101777/1/EfiAfrizalPSKM2021.pdf Afrizal, Efi (2021) Resistance prediction of double acting tanker in ice condition. PhD thesis, Universiti Teknologi Malaysia, Faculty of Engineering - School of Mechanical Engineering. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:147025
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Afrizal, Efi
Resistance prediction of double acting tanker in ice condition
description An icebreaker ship should have ice bow design at its stem part. It should have ice bow design because a common bow design has high resistance when sailing in open water. In order to solve the problem, previous researchers had introduced a Double-Acting Tanker (DAT) which is able to sail astern on sea surface covered by ice and sailing ahead in open water. The main problems are liaised with hull, ice, and propeller interactions during the DAT ship sailing astern which is very complex and simulation software is unable to simulate. In addition, the model scale test in the towing tank needs a full scale data of ice resistance. The aim of this work was to propose an empirical method to predict the resistance of DAT based on Koto method. The resistance components were water resistance, friction resistance, momentum resistance, immersion resistance and breaking resistance. The dimensionless constants for each resistance component were determined by using multiple regression variables. The forward sailing resistance of a DAT model was simulated at 0.4 m/s, 0.5 m/s and 0.6 m/s to predict the suction force of the propeller disc effect when DAT sailing at 1.8 m/s, 2.4 m/s and 2.7 m/s in iced sea surface condition. DAT resistance was predicted using the Finite Element Method (FEM) in Eulerian-Lagrangian Coupled theory (CEL) to detect the interactions between ship and ice sheets. The results showed that the ice sheet warms up when DAT sails forward and the ice sheet bends when DAT sails astern. The required force to break the ice sheet when sailing astern is less than the one sailing forward because of the critical bended length is shorter than normal bended length. The simulation results using the proposed empirical method show a good agreement with the experimental data. A total of 60% drag decreased when DAT sails backward. The significance of this study is the complexity of the astern sailing was explained clearly when the resistance of DAT was predicted by using empirical method.
format Thesis
author Afrizal, Efi
author_facet Afrizal, Efi
author_sort Afrizal, Efi
title Resistance prediction of double acting tanker in ice condition
title_short Resistance prediction of double acting tanker in ice condition
title_full Resistance prediction of double acting tanker in ice condition
title_fullStr Resistance prediction of double acting tanker in ice condition
title_full_unstemmed Resistance prediction of double acting tanker in ice condition
title_sort resistance prediction of double acting tanker in ice condition
publishDate 2021
url http://eprints.utm.my/id/eprint/101777/1/EfiAfrizalPSKM2021.pdf
http://eprints.utm.my/id/eprint/101777/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:147025
_version_ 1772811112775942144
score 13.211869

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