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TECHNICAL PAPERS

Green Water Loading on a FPSO

[+] Author and Article Information
O. M. Faltinsen, M. Greco

Department of Marine Hydrodynamics, NTNU, Trondheim, Norway

M. Landrini

INSEAN, The Italian Ship Model Basin, Via di Vallerano 139, 00128, Roma, Italye-mail: maulan@waves.insean.it

J. Offshore Mech. Arct. Eng 124(2), 97-103 (Apr 11, 2002) (7 pages) doi:10.1115/1.1464128 History: Received November 01, 2001; Revised November 01, 2001; Online April 11, 2002
Copyright © 2002 by ASME
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References

Figures

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First four water-on-deck events for a vertical bow (left) and a bow with a stem overhang of 45° (right). The body motions are restrained. T=wave period. tlast−twod=duration of green-water loading.
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Influence of trim angle. Top: sketch of the problem. Bottom: cases ζ5=−5° and 0° are compared for the first (top) and the second (bottom) water-on-deck events and restrained body conditions. α=0°,L/D=10,λ/L=1.5,H/λ=0.064 and f/H=0.38.Δτwod=(t−twod) g/D.
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History of water level hw (meters) at locations A-D along the ship centerplane, respectively, at ≃0.34, 0.88, 1.21, and 1.53D from the bow. Numerical results (solid lines) and three-dimensional experiments (dashed lines) by Buchner 5. Time is expressed in seconds and twod is the instant when the water shipping starts.
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Distribution of pressure p along a vertical wall hit by an infinite fluid wedge with impact velocity V and semi-angle β.α=0. Pressure evaluated numerically through the zero-gravity similarity solution by 9 for different values of β. y=0 corresponds to the deck. t=0 is initial time of impact. ρ=mass density of fluid.
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Distribution of pressure p along a vertical wall hit by an infinite fluid wedge with impact velocity V and semi-angle β.α=0. Pressure evaluated numerically through the zero-gravity similarity solution by 9, solid lines, and solution by Wagner method, dashed lines. See Fig. 4 for additional explanations.
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Conformal mapping used in the asymptotic solution for small β (triangles in Fig. 8).
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Free-surface evolution close to a wall hit by an infinite fluid wedge with impact velocity V and semi-angle β. Asymptotic solution for small β, dashed lines, similarity solution by 9, solid lines. See Fig. 4 for additional explanations.
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Maximum pressure on a wall hit by an infinite fluid wedge with impact velocity V and semi-angle β. Asymptotic solution for small β, triangles, pressure evaluated numerically through the zero-gravity similarity solution by 9, solid line, Wagner method, full squares.
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Time evolution of the normal force on an inclined wall due to an impact with a fluid wedge with semi-angle β=11°. Different values of slope α of the wall are given. Δτ=tg/h.h=initial dam breaking height. See Fig. 4 for additional explanations.
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Pressure distribution on an inclined wall at three time instants after the impact with a fluid wedge with semi-angle β=11°. The curves shown refer to the cases in Fig. 9.
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Example of dimensions for the stiffeners on a FPSO ship; dimensions are in mm.
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2-D experiments of water on deck; Snapshots of the free surface during the water shipping

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