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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

O’Dea, J. F., and Walden, D. A., 1984, “The Effect of Bow Shape and Nonlinearities on the Prediction of Large Amplitude Motion and Deck Wetness,” Proc. 15th Symp. on Naval Hydrod., Hamburg, National Academy Press, Washington D.C., pp. 163–176.
Lloyd, A. R. J. M., Salsich, J. O., and Zseleczky, J. J., 1985, “The Effect of Bow Shape on Deck Wetness in Head Seas,” Royal Institution of Naval Architects, Trans. RINA, pp. 9–25.
Ochi, M. K., 1964, “Extreme Behavior of a Ship in Rough Seas-Slamming and Shipping of Green Water,” Annual Meeting of the Society of Naval Architects and Marine Engineers, SNAME, New York, pp. 143–202.
Buchner, B., and Cozijn, J. L., 1997, “An Investigation into the Numerical Simulation of Green Water,” Proc. BOSS’97, Delft, Elsevier Science, Oxford, 2 , pp. 113–125.
Buchner, B., 1995, “On the Impact of Green Water Loading on Ship and Offshore Unit Design,” Proc. PRADS’95, Seoul, Society of Naval Architects of Korea, 1 , pp. 430–443.
Mizogushi, S., 1989, “Design of Freeboard Height with the Numerical Simulation on the Shipping Water,” Proc. PRADS’89, Varna, Bulgarian Ship Hydrodynamics Center, pp. 103.1–8.
MARINTEK, 2000, Review, No. 1.
Greco, M., Faltinsen, O. M., and Landrini, M., 2000, “Basic Studies of Water on Deck,” Proc. 23rd Symp. on Naval Hydrod., Val de Reuil, National Academy Press, Washington D.C., 1 , pp. 108–123.
Zhang,  S., Yue,  D. K. P., and Tanizawa,  K., 1996, “Simulation of Plunging Wave Impact on a Vertical Wall,” J. Fluid Mech., 327, pp. 221–254.
Zhao,  R., and Faltinsen,  O. M., 1993, “Water Entry of Two-Dimensional Bodies,” J. Fluid Mech., 246, pp. 593–612.
Greco, M., Faltinsen, O. M., and Landrini, M., 2000, “An Investigation of Water on Deck Phenomena,” Proc. 15th Int. Workshop on Water Waves and Floating Bodies, Caesarea, T. Miloh and G. Zilman (eds.), pp. 55–58.
Greco, M., Faltinsen, O. M., and Landrini, M., 2000, “A Parametric Study of Water on Deck Phenomena,” Proc. NAV 2000, Int. Conf. on Ship and Shipping Research, 2 , pp. 7.7.1–12.
Wagner,  H., 1932, “Über Stoss- und Gleitvorgänge an der Oberfläche von Flüssigkeiten,” Z. Angew. Math. Mech., 12, No. 4, pp. 192–235.
Faltinsen,  O. M., 2000, “Hydroelastic slamming,” J. Marine Science and Technology, 5, No. 2, pp. 49–65.
Tulin, M. P., and Landrini, M., 2000, “Breaking waves in the ocean and around ships,” Proc. of 23rd Symp. on Naval Hydrod., Val de Reuil, National Academy Press, Washington D.C., 4 , pp. 1–32.

Figures

Grahic Jump Location
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.
Grahic Jump Location
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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