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UBC Theses and Dissertations
Effect of parabolization on viscous resistance of displacement vessels Klaptocz, Voytek R.
Abstract
The addition of parabolic side bulbs at the ship's mid body is aimed at reducing wavemaking resistance. This concept was first successfully tested on a coaster tanker and then extended to the UBC Series Model 3, a typical Canadian West Coast fishing vessel. A series of systematic tow tank experiments revealed that while parabolization decreases the total resistance (due to a drop in wave-making resistance) the form factor suffers an increase. This thesis focuses on numerical predictions of the influence of side bulbs on the viscous resistance characteristics of a displacement vessel. An integral boundary method solver and a 2D RANS solver were chosen as tools to predict the effect of parabolization on viscous drag for the UBC Series Model 3 hulls and the UBC Series Model 4. The concept of parabolization was then extended to an NPL Trimaran hull. A 3D RANS code was used to compare the calculated values of skin friction and boundary layer thickness to those calculated by the integral boundary layer solver. The RANS code was also used to numerically predict the effect of parabolization on viscous pressure drag for the NPL hull. In total, three different bulbs were studied numerically in addition to the parent NPL hull. The numerical results were compared to experimental data obtained from calm water resistance predictions obtained from tow tank testing. Further effort to decrease the impact of parabolization on form factor was made by applying moving surface boundary layer control to the UBC Series Model 4.
Item Metadata
Title |
Effect of parabolization on viscous resistance of displacement vessels
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2006
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Description |
The addition of parabolic side bulbs at the ship's mid body is aimed at reducing wavemaking
resistance. This concept was first successfully tested on a coaster tanker and then
extended to the UBC Series Model 3, a typical Canadian West Coast fishing vessel. A
series of systematic tow tank experiments revealed that while parabolization decreases
the total resistance (due to a drop in wave-making resistance) the form factor suffers an
increase. This thesis focuses on numerical predictions of the influence of side bulbs on
the viscous resistance characteristics of a displacement vessel.
An integral boundary method solver and a 2D RANS solver were chosen as tools to
predict the effect of parabolization on viscous drag for the UBC Series Model 3 hulls and
the UBC Series Model 4. The concept of parabolization was then extended to an NPL
Trimaran hull. A 3D RANS code was used to compare the calculated values of skin
friction and boundary layer thickness to those calculated by the integral boundary layer
solver. The RANS code was also used to numerically predict the effect of parabolization
on viscous pressure drag for the NPL hull. In total, three different bulbs were studied
numerically in addition to the parent NPL hull. The numerical results were compared to
experimental data obtained from calm water resistance predictions obtained from tow
tank testing. Further effort to decrease the impact of parabolization on form factor was
made by applying moving surface boundary layer control to the UBC Series Model 4.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-01-07
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0080736
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2006-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.