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Research Papers: CFD and VIV

A Three-Step Hybrid Method to Study the Influence of Green Water Impact on a Large Containership in Time Domain

[+] Author and Article Information
Ravindra Babu Kudupudi

Department of Ocean Engineering and
Naval Architecture,
IIT Kharagpur,
Kharagpur 721302, India
e-mail: ravindra.kudupudi@iitkgp.ac.in

Sumit Kumar Pal

Department of Ocean Engineering and
Naval Architecture,
IIT Kharagpur,
Kharagpur 721302, India
e-mail: sumitkpal@iitkgp.ac.in

Ranadev Datta

Department of Ocean Engineering and
Naval Architecture,
IIT Kharagpur,
Kharagpur 721302, India
e-mail: ranadev@naval.iitkgp.ac.in

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 December 19, 2018; final manuscript received April 2, 2019; published online May 8, 2019. Assoc. Editor: Hans Bihs.

J. Offshore Mech. Arct. Eng 141(5), 051804 (May 08, 2019) (10 pages) Paper No: OMAE-18-1215; doi: 10.1115/1.4043416 History: Received December 19, 2018; Revised April 02, 2019

The paper introduces a simplified coupled computational fluid dynamics–boundary element method–finite element method (CFD–BEM–FEM)-based approach to study the effect green water induced loading on global structural responses such as bending moment and shear force. The proposed numerical scheme is based on a coupled three-step model. Initially, rigid modes of structural motions are calculated adopting a three-dimensional (3D) time domain panel method without incorporating the green water loading. The time histories of the green water impact on the deck are computed using a finite volume-based CFD tool with these precalculated rigid body motions. Finally, the problem of fluid–structure interaction is solved by considering the green water force as an external input. The direct integration scheme (i.e., Newmark–Beta method in the time domain) is employed to solve this structural problem modeled with one-dimensional FEM. To check the robustness and efficacy of the proposed model and to evaluate green water effect on the structure and vice versa, a large container vessel with and without forward speed is investigated. The impact is studied with respect to motion, shear force, and bending moment. The results confirm that the impact of green water and structural flexibility is significant. Therefore, these effects must be considered while designing a container ship. Also, from the results, it appears that the present three-step model is an effective, efficient, and useful practical tool to predict such effects.

Copyright © 2019 by ASME
Topics: Water , Ships , Hull
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References

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Figures

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Fig. 2

Nonuniform beam idealization of the ship and degrees-of-freedom of an element

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Fig. 1

Analysis flowchart

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Fig. 3

Schematic diagram showing coordinate systems

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Fig. 6

Computational domain grid

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Fig. 7

Flow behavior on the FPSO

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Fig. 8

Time history of the impact pressure on the deck for λ/L=0.8, Fn=0.0

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Fig. 17

(a) Vertical bending moment time series at x=13.015 m from FP for λ/L=1.0, Fn=0.2, (b) vertical bending moment time series at midship of the hull for λ/L=1.0, Fn=0.2, and (c) variation of the vertical bending moment along the hull for λ/L=1.0, Fn=0.2

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Fig. 4

Schematic representation of the panel and FE model

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Fig. 5

Schematic view of the ship

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Fig. 12

(a) Heave time history at midship of the hull for λ/L=1.0, Fn=0.15 and (b) pitch time history at midship of the hull for λ/L=1.0, Fn=0.15

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Fig. 13

Green water pressure at the deck of the hull for λ/L=1.0, Fn=0.15

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Fig. 14

Vertical displacement along the length of the hull for λ/L=1.0, Fn=0.15

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Fig. 15

(a) Vertical bending moment time series at x=13.015 m from FP for λ/L=1.0, Fn=0.15, (b) vertical bending moment time series at x=13.015 m from FP for λ/L=1.0, Fn=0.15, (c) vertical bending moment time series at midship of the hull for λ/L=1.0, Fn=0.15, (d) vertical bending moment time series at midship of the hull for λ/L=1.0, Fn=0.15, and (e) variation of the vertical bending moment along the hull for λ/L=1.0, Fn=0.15

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Fig. 16

Green water pressure at the deck of the hull for λ/L=1.0, Fn=0.2

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Fig. 9

(a) Vertical bending moment time series at x=12.5 m from FP for λ/L=0.8, Fn=0.0, (b) vertical bending moment time series at x=12.5 m from FP for λ/L=0.8, Fn=0.0, (c) vertical bending moment time series at midship of the hull for λ/L=0.8, Fn=0.0, and (d) variation of the vertical bending moment along the hull for λ/L=0.8, Fn=0.0

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Fig. 10

Grid convergence for the CFD model for λ/L=1.0, Fn=0.15

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Fig. 11

Convergence of the total pressure along the length λ/L=1.0, Fn=0.15

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