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UBC Theses and Dissertations
Analysis of [pi]-type floating breakwater in oblique waves Gesraha, Mohamed M. R.
Abstract
The present study investigates the diffraction problem of waves interacting with a long rectangular breakwater with two side plates, for brevity it will be referred to as pi-type. The effect of the addition of two side-boards on the performance of a rectangular breakwater is the main aim of this study. The structure is assumed to be placed in water of uniform constant depth, and an eigenfunction expansion method was used in the solution. The fluid is assumed inviscid, and the flow irrotational, so that a velocity potential may be used to describe the flow. The exciting forces, added masses, damping coefficients, responses of the structure, and the transmission coefficient were all calculated for different cases and their results were analyzed. Different waves approaching the breakwater from any direction are considered. Comparisons between the present approach and different numerical solutions published previously were used to verify the developed numerical model. Other comparisons between the traditional rectangular breakwater and the proposed pi-type breakwater are also performed. The present solution proved to be a fast accurate method as compared to other methods. The present study showed that maximum wave forces and heave response occur for the normal wave incidence, but the surge and pitch responses are not maximum for normal waves and different directions then need to be considered. The proposed breakwater experiences lower exciting forces when compared to a rectangular one having the same under-tip clearance, thus savings of materials and cost are achieved by using this type, provided its good performance with respect to wave transmission is assumed. The numerical results showed good agreement with the measured transmission coefficient for both the fixed structure and freely floating structure cases.
Item Metadata
Title |
Analysis of [pi]-type floating breakwater in oblique waves
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1998
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Description |
The present study investigates the diffraction problem of waves interacting with a
long rectangular breakwater with two side plates, for brevity it will be referred to as pi-type.
The effect of the addition of two side-boards on the performance of a rectangular
breakwater is the main aim of this study. The structure is assumed to be placed in water
of uniform constant depth, and an eigenfunction expansion method was used in the
solution. The fluid is assumed inviscid, and the flow irrotational, so that a velocity
potential may be used to describe the flow. The exciting forces, added masses, damping
coefficients, responses of the structure, and the transmission coefficient were all
calculated for different cases and their results were analyzed. Different waves
approaching the breakwater from any direction are considered. Comparisons between the
present approach and different numerical solutions published previously were used to
verify the developed numerical model. Other comparisons between the traditional
rectangular breakwater and the proposed pi-type breakwater are also performed.
The present solution proved to be a fast accurate method as compared to other
methods. The present study showed that maximum wave forces and heave response occur
for the normal wave incidence, but the surge and pitch responses are not maximum for
normal waves and different directions then need to be considered. The proposed
breakwater experiences lower exciting forces when compared to a rectangular one having
the same under-tip clearance, thus savings of materials and cost are achieved by using this
type, provided its good performance with respect to wave transmission is assumed. The
numerical results showed good agreement with the measured transmission coefficient for
both the fixed structure and freely floating structure cases.
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Extent |
3387570 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-23
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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 |
10.14288/1.0050153
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
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.