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Research Papers: Offshore Technology

Computation of Ship-to-Ship Interaction Forces by a Three-Dimensional Potential-Flow Panel Method in Finite Water Depth

[+] Author and Article Information
Xueqian Zhou, Serge Sutulo

Centre for Marine Technology
and Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal

C. Guedes Soares

Fellow ASME
Centre for Marine Technology
and Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 22, 2011; final manuscript received June 18, 2014; published online September 1, 2014. Assoc. Editor: M.H. (Moo-Hyun) Kim.

J. Offshore Mech. Arct. Eng 136(4), 041301 (Sep 01, 2014) (8 pages) Paper No: OMAE-11-1032; doi: 10.1115/1.4027894 History: Received April 22, 2011; Revised June 18, 2014

A double-body 3D potential-flow code developed earlier for computing hydrodynamic interaction forces and moments acting on the hulls of the ships sailing in close proximity with neighboring ships or some other obstacles, is extended to the shallow water case. Two methods for accounting for the finite water depth were implemented: (1) using truncated mirror image series and (2) distribution of an additional single layer of sources on parts of the seabed beneath the moving hulls. While the first method does only apply to the flat horizontal seabed, the second one can also deal with the arbitrary bathymetry situations. As appropriate choice of the discretization parameters can significantly affect the accuracy and efficiency of the second method, the present contribution focuses on comparative computations aiming at defining reasonable dimensions of the moving paneled area on the sea bottom and maximum admissible size of the bottom panel. As result, conclusions concerning optimal parameters of the additional set of panels are drawn.

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References

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Sutulo, S., and Guedes Soares, C., 2008, “Simulation of the Hydrodynamic Interaction Forces in Close-Proximity Maneuvering,” Proceedings of the 27th Annual International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2008, Estoril, Portugal, June 15–19, Paper No. OMAE2008-57938, p. 10.
Rodrigues, J. M., Sutulo, S., and Guedes Soares, C., 2006, “Estimation of Hydrodynamic Inertial Forces Acting on Ships in the Presence of Obstacles by a 3D Panel Method,” Innovation and Development in Maritime Activities, C.Guedes Soares, and V. G.de Brito, eds., Salamandra Edition, Lisboa, Lisbon, Portugal, pp. 661–676 (in Portuguese).
Kochin, N. E., Kibel, I. A., and Roze, N. V., 1964, Theoretical Hydromechanics, Interscience, New York.
Söding, H., 1993, “A Method for Accurate Force Calculations in Potential Flow,” Ship Technol. Res., 40, pp. 176–188.
Sutulo, S., and Guedes Soares, C., 2009, “Simulation of Close-Proximity Maneuvers Using an Online 3D Potential Flow Method,” Proceedings of the International Conference on Marine Simulation and Ship Maneuverability, MARSIM 2009, Panama City, Panama, Aug. 17–20, pp. M-9-1–M-9-10.
Fonfach, J. M. A., Sutulo, S., and Guedes Soares, C., 2011, “Numerical Study of Ship-to-Ship Interaction Forces on the Basis of Various Flow Models,” Proceedings of the 2nd International Conference on Ship Maneuvering in Shallow and Confined Water STS-2011, Trondheim, Norway, May 18–20, pp. 137–146.
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Sutulo, S., Guedes Soares, C., and Otzen, J. F., 2012, “Validation of Potential-Flow Estimation of Interaction Forces Acting Upon Ship Hulls in Side-to-side Motion,” J. Ship Res., 56(3), pp. 129–145. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Influence of the bottom panel size on the results for added masses, results by mirror image as reference, h = 15 m

Grahic Jump Location
Fig. 2

Influence of the bottom panel size on the results for added masses, results by the mirror image method as reference, h = 20 m

Grahic Jump Location
Fig. 3

Influence of the bottom panel size on the results for added masses, results by the mirror image method as reference, h = 30 m

Grahic Jump Location
Fig. 4

Influence of the bottom panel size on the results for added masses, results by the mirror image method as reference, h = 50 m

Grahic Jump Location
Fig. 5

Influence of the total area of the patch on the results for added masses, results by the mirror image method as reference, h = 15 m

Grahic Jump Location
Fig. 6

Influence of the total area of the patch on the results for added masses, results by the mirror image method as reference, h = 20 m

Grahic Jump Location
Fig. 7

Influence of the total area of the patch on the results for added masses, results by the mirror image method as reference, h = 30 m

Grahic Jump Location
Fig. 8

Influence of the total area of the patch on the results for added masses, results by the mirror image method as reference, h = 50 m

Grahic Jump Location
Fig. 9

Surge forces acting on ship 1, at h = 15 m

Grahic Jump Location
Fig. 10

Sway forces acting on ship 1, at h = 15 m

Grahic Jump Location
Fig. 11

Yaw moments acting on ship 1, at h = 15 m

Grahic Jump Location
Fig. 12

Surge forces acting on ship 2, at h = 15 m

Grahic Jump Location
Fig. 13

Sway forces acting on ship 2, at h = 15 m

Grahic Jump Location
Fig. 14

Yaw moments acting on ship 2, at h = 15 m

Grahic Jump Location
Fig. 15

Surge forces acting on ship 1, at h = 30 m

Grahic Jump Location
Fig. 16

Sway forces acting on ship 1, at h = 30 m

Grahic Jump Location
Fig. 17

Yaw moments acting on ship 1, at h = 30 m

Grahic Jump Location
Fig. 18

Surge forces acting on ship 2, at h = 30 m

Grahic Jump Location
Fig. 19

Sway forces acting on ship 2, at h = 30 m

Grahic Jump Location
Fig. 20

Yaw moments acting on ship 2, at h = 30 m

Grahic Jump Location
Fig. 21

Configuration of two interacting ships sailing over an inclined bottom, measures are in meters

Grahic Jump Location
Fig. 22

Nondimensionalized surge and sway forces on interacting ships sailing over an inclined bottom

Grahic Jump Location
Fig. 23

Nondimensionalized yaw moments on interacting ships sailing over an inclined bottom

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