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Offshore and Structural Mechanics

Parametrical and Motion Analysis of a Moored Rectangular Floating Breakwater

[+] Author and Article Information
Ghassan Elchahal

Institut Charles Delaunay, FRE CNRS 2848, University of Technology of Troyes, 12 Rue Marie Curie, BP 2060, 10010 Troyes, Franceghassan.el_chahal@utt.fr

Rafic Younes

3M Mechanical Engineering Laboratory, Lebanese University, Rafic Harriri Campus, Beirut, Lebanonryounes@ul.edu.lb

Pascal Lafon

Institut Charles Delaunay, FRE CNRS 2848, University of Technology of Troyes, 12 Rue Marie Curie, BP 2060, 10010 Troyes, Francepascal.lafon@utt.fr

J. Offshore Mech. Arct. Eng 131(3), 031303 (Jun 02, 2009) (11 pages) doi:10.1115/1.3124125 History: Received June 11, 2007; Revised March 04, 2009; Published June 02, 2009

Moored floating breakwaters with a leeward boundary, assimilating the port quay walls are described by a large number of coupled variables. This complicates their design and requires a detailed parametrical and motion analysis to assess their hydrodynamic performance. A diffraction-radiation boundary value problem is developed. It arises from the interaction of linear waves on a moored floating breakwater with a leeward boundary described by a partial reflective sidewall. The effects of the sidewall clearance, structural parameters, mooring lines stiffness, and their angle of inclination on the transmission coefficient and the dynamic motion of the floating breakwater are considered. The transmission coefficient is strongly affected by the motion itself and the allowable length change in the mooring lines.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Definition sketch for theoretical analysis with a sidewall

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Figure 2

Representation of a hydrodynamic and a mechanic mass-spring system

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Figure 3

Effect of clearance distance on the transmitted wave height (kr=1, left; kr=0.3, right)

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Figure 4

Effect of breakwater draft on the transmission coefficient (kr=1, left; kr=0.3, right)

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Figure 5

Effect of breakwater draft on the motion responses (kr=0.3)

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Figure 6

Effect of breakwater width on the transmission coefficient (kr=1, left; kr=0.3, right)

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Figure 7

Effect of the mooring line angle on the transmission coefficient (kr=1, left; kr=0.3, right)

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Figure 8

Effect of the mooring line angle on the motion of the breakwater (kr=0.3)

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Figure 9

Effect of the mooring line stiffness on the transmission coefficient (kr=1, left; kr=0.3, right)

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Figure 10

Effect of the mooring line stiffness on the motion of the breakwater (kr=0.3)

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Figure 11

Effect of radiated waves on the transmission coefficient: S1, left; S2, right (kr=0.3)

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