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Research Papers

Effective and Efficient Breakwater Design for Trading Vessels and FPSOS

[+] Author and Article Information
Kamlesh Varyani

Department of Naval Architecture and Marine Engineering, Universities of Glasgow and Strathclyde, Glasgow G1 1XN, Scotland, UKk.s.varyani@na-me.ac.uk

Trevor Hodgson

 Galbraith Consulting Limited, 8-10 High Street, Laurencekirk, Kincardineshire AB30 1RT, UKtrevor@galbraithconsulting.co.uk

Xuan Pham

Department of Naval Architecture and Marine Engineering, Universities of Glasgow and Strathclyde, Glasgow G1 1XN, Scotland, UKxuan.pham@strath.ac.uk

J. Offshore Mech. Arct. Eng 130(2), 021004 (Feb 28, 2008) (7 pages) doi:10.1115/1.2746403 History: Received November 08, 2006; Revised April 12, 2007; Published February 28, 2008

Breakwaters obviously need to fulfill their function (protecting sensitive structures or cargo) while at the same time remaining intact and imposing manageable loads onto supporting structure. It goes without saying that such breakwaters should be cost effective, so that complex designs with extensive welding may not be preferable. In this paper the authors discuss green water loading on breakwaters for trading vessels like container ships which have forward speed and FPSOs which have zero speed. Different generic designs of V shape, vane type, double skin with and without holes, and forward sloping forecastle (whaleback deck) breakwaters applied to trading vessels are discussed. Guidelines for modeling green water horizontal loading on breakwaters of FPSOs and trading vessels using computational fluid dynamics (CFD) techniques are provided. The paper will also include a review of breakwater design criteria in rules and regulations.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Body plan of containership S-175

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Figure 2

Experimental setup of devices

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Figure 3

Vertical load cell plate mechanical arrangement

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Figure 4

Time histories of water elevation measured by two inline wave probes are used to approximate green water velocity

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Figure 5

Approximation of longitudinally sectional shape of green water volume

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Figure 6

Initial setup of green water CFD simulation with model of dam break with initial velocity

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Figure 7

Horizontal loading at LC8

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Figure 8

Generic design of V shape and vane type breakwaters

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Figure 9

Initial geometrical setup for simulation of V shape breakwater in FLUENT

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Figure 10

Initial geometrical setup for simulation of vane-type breakwater in FLUENT

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Figure 11

Force history on the vertical wall (maximum green water elevation is twice the height of the breakwater)

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Figure 12

Force history on the vertical wall (maximum green water elevation is equal to the height of breakwater)

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Figure 13

Overriding water is generally more in case of vane-type breakwater

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Figure 14

Double skin breakwater with perforation

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Figure 15

Effects of breakwater and perforation in reducing green water load on vertical wall

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Figure 16

Water jets through perforations in breakwater

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Figure 17

Design of whaleback deck

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Figure 18

Modeling of whaleback deck in FLUENT

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Figure 19

Total loading on vertical wall in heavy green water condition (maximum green water elevation is twice the height of whaleback deck)

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