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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

Figures

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Fig. 1

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

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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

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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

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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

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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

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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

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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

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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

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Fig. 9

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

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Fig. 10

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

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Fig. 11

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

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Fig. 12

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

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Fig. 13

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

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Fig. 14

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

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Fig. 15

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

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Fig. 16

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

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Fig. 17

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

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Fig. 18

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

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Fig. 19

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

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Fig. 20

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

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Fig. 21

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

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Fig. 22

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

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Fig. 23

Nondimensionalized yaw moments on interacting ships sailing over an inclined bottom

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