Reduction of wave resistance of displacement vessels by waterline parabolization

S. M. Çalışal; D. B. Danışman; K. Gould; P. Maurice; V. Klaptocz

doi:10.5957/SMC-2009-053

Reduction of wave resistance of displacement vessels by waterline parabolization

S. M. Çalışal, D. B. Danışman, Gören, K. Gould, P. Maurice, V. Klaptocz

Department of Naval Architecture and Marine Engineering

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

Abstract

Waterline parabolization is a method to reduce the wave resistance of a displacement type hull with a parallel mid-body by adding amidships bulbs to the hull. Tow tank tests of the optimized bulbs at ITU confirmed that significant reductions in total resistance were obtained. This paper describes the use of a nonlinear optimization technique developed at the University of British Columbia (UBC) and tank testing at Istanbul Technical University (ITU) to find the optimum shape and location of midship bulbs as well as midship bulbs and a bow bulb together. Tow-tank tests at UBC and ITU have shown that mid-ship bulbs can provide significant reductions in total resistance. The study validated the use of the technique both constraining the displacement and when only constraining the draft (retrofit). The optimization algorithm considers only wave resistance which is calculated with a Dawson's method type program; TRAWSON. In this study a RO/RO ferry hull is used as the baseline hull form. The tank tests revealed that the bulb location and geometry identified as the optimum, at Froude number Fn = 0.33, by the optimization program achieved a reduction in total resistance of 15 percent at constant displacement and retrofit applications.

Original language	English
DOIs	https://doi.org/10.5957/SMC-2009-053
Publication status	Published - 2009
Event	SNAME Maritime Convention 2009, SMC 2009 - Providence, United States Duration: 21 Oct 2009 → 23 Oct 2009

Conference

Conference	SNAME Maritime Convention 2009, SMC 2009
Country/Territory	United States
City	Providence
Period	21/10/09 → 23/10/09

Bibliographical note

Publisher Copyright:
© SNAME Maritime Convention 2009, SMC 2009. All rights reserved.

Funding

The authors would like to thank NSERC, Oceanics for the financial support received for the research done at UBC. We all acknowledge the contribution James McRoberts, Mahmoud Alidadi, Yavar Naddaf for their help in writing the software suite, and Murat Özbulut for his help in tow-tank experiments at ITU. Thanks are also due to J, McRoberts for his help in writing the optimization section of the paper. The research group and especially Voytek Klaptocz would like to thank STX Canada Marine for allowing us to use their computers.

Funders	Funder number
Natural Sciences and Engineering Research Council of Canada
University of British Columbia

Keywords

Amidshipsbulbs
Bowbulbs
Ferry
Optimization
Ship resistance

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.5957/SMC-2009-053

Cite this

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abstract = "Waterline parabolization is a method to reduce the wave resistance of a displacement type hull with a parallel mid-body by adding amidships bulbs to the hull. Tow tank tests of the optimized bulbs at ITU confirmed that significant reductions in total resistance were obtained. This paper describes the use of a nonlinear optimization technique developed at the University of British Columbia (UBC) and tank testing at Istanbul Technical University (ITU) to find the optimum shape and location of midship bulbs as well as midship bulbs and a bow bulb together. Tow-tank tests at UBC and ITU have shown that mid-ship bulbs can provide significant reductions in total resistance. The study validated the use of the technique both constraining the displacement and when only constraining the draft (retrofit). The optimization algorithm considers only wave resistance which is calculated with a Dawson's method type program; TRAWSON. In this study a RO/RO ferry hull is used as the baseline hull form. The tank tests revealed that the bulb location and geometry identified as the optimum, at Froude number Fn = 0.33, by the optimization program achieved a reduction in total resistance of 15 percent at constant displacement and retrofit applications.",

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note = "Publisher Copyright: {\textcopyright} SNAME Maritime Convention 2009, SMC 2009. All rights reserved.; SNAME Maritime Convention 2009, SMC 2009 ; Conference date: 21-10-2009 Through 23-10-2009",

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AU - Danışman, D. B.

AU - Gören,

AU - Gould, K.

AU - Maurice, P.

AU - Klaptocz, V.

PY - 2009

Y1 - 2009

N2 - Waterline parabolization is a method to reduce the wave resistance of a displacement type hull with a parallel mid-body by adding amidships bulbs to the hull. Tow tank tests of the optimized bulbs at ITU confirmed that significant reductions in total resistance were obtained. This paper describes the use of a nonlinear optimization technique developed at the University of British Columbia (UBC) and tank testing at Istanbul Technical University (ITU) to find the optimum shape and location of midship bulbs as well as midship bulbs and a bow bulb together. Tow-tank tests at UBC and ITU have shown that mid-ship bulbs can provide significant reductions in total resistance. The study validated the use of the technique both constraining the displacement and when only constraining the draft (retrofit). The optimization algorithm considers only wave resistance which is calculated with a Dawson's method type program; TRAWSON. In this study a RO/RO ferry hull is used as the baseline hull form. The tank tests revealed that the bulb location and geometry identified as the optimum, at Froude number Fn = 0.33, by the optimization program achieved a reduction in total resistance of 15 percent at constant displacement and retrofit applications.

AB - Waterline parabolization is a method to reduce the wave resistance of a displacement type hull with a parallel mid-body by adding amidships bulbs to the hull. Tow tank tests of the optimized bulbs at ITU confirmed that significant reductions in total resistance were obtained. This paper describes the use of a nonlinear optimization technique developed at the University of British Columbia (UBC) and tank testing at Istanbul Technical University (ITU) to find the optimum shape and location of midship bulbs as well as midship bulbs and a bow bulb together. Tow-tank tests at UBC and ITU have shown that mid-ship bulbs can provide significant reductions in total resistance. The study validated the use of the technique both constraining the displacement and when only constraining the draft (retrofit). The optimization algorithm considers only wave resistance which is calculated with a Dawson's method type program; TRAWSON. In this study a RO/RO ferry hull is used as the baseline hull form. The tank tests revealed that the bulb location and geometry identified as the optimum, at Froude number Fn = 0.33, by the optimization program achieved a reduction in total resistance of 15 percent at constant displacement and retrofit applications.

KW - Amidshipsbulbs

KW - Bowbulbs

KW - Ferry

KW - Optimization

KW - Ship resistance

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M3 - Paper

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T2 - SNAME Maritime Convention 2009, SMC 2009

Y2 - 21 October 2009 through 23 October 2009

ER -

Reduction of wave resistance of displacement vessels by waterline parabolization

Abstract

Conference

Bibliographical note

Funding

Keywords

UN SDGs

Access to Document

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