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Research Papers: Offshore Geotechnics

Study on the Sloshing of Nickel Ore Slurries With Three Different Moisture Contents

[+] Author and Article Information
Jianwei Zhang

Department of Marine Engineering,
Dalian Maritime University,
Dalian 116026, China
e-mail: zjw220dlmu@163.com

Wanqing Wu

Department of Marine Engineering,
Dalian Maritime University,
Dalian 116026, China
e-mail: wuwanqingdmu@sina.com

Junquan Hu

Department of Marine Engineering,
Dalian Maritime University,
Dalian 116026, China
e-mail: hujunquan@shmsa.gov.cn

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 11, 2016; final manuscript received November 28, 2016; published online April 5, 2017. Assoc. Editor: Lizhong Wang.

J. Offshore Mech. Arct. Eng 139(3), 032001 (Apr 05, 2017) (7 pages) Paper No: OMAE-16-1040; doi: 10.1115/1.4035476 History: Received April 11, 2016; Revised November 28, 2016

A combination of the moisture content, dynamic energy produced by the waves and the vessel engines along with the characteristics of the bulk cargo itself may lead the mixture to liquefy. When the liquefaction of the granular bulk cargo occurs, it may behave like a fluid and can cause the vessel to list or even capsize. In this study, based on a computational fluid dynamics (CFD) solver, a numerical model was developed to simulate the sloshing problem for nickel ore slurries with three different moisture contents. The volume of fluid (VOF) method is adopted to capture the movement of the fluid interface. To validate the present model, the simulation results were compared with experimental data. The numerical results are in good agreement with the experimental results. Finally, the present model was used to investigate the dynamic behavior of nickel ore slurries with different moisture contents combined with non-Newtonian Herschel–Bulkley and Bingham constitutive equations. After taking the grid and time step independence study, the dynamic moment impacted on the cargo hold model boundaries was calculated. The effects of different moisture contents, the excitation amplitude, and the frequency on the sloshing-induced moment and the free surface deformation were discussed extensively. The results confirm that the proposed model can be used to predict the movement of the nickel ore slurry and analyze its impact moment on the cargo hold model when it takes a roll motion.

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Figures

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Fig. 1

Sketch of the cargo hold model (a) and the mesh arrangement (b)

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Fig. 2

Comparison of moment computed with different time steps

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Fig. 3

Comparison of moment computed with different meshes

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Fig. 4

Comparison of moment with the experimental results of Ref. [6] for slurry 3 and A=10deg and T=4 s

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Fig. 5

Comparison of moment with the experimental results of Ref. [6] for slurry 3 and A=7deg and T=4 s

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Fig. 6

The variation of the pressure at the location of the pressure sensor when A=10deg and T=4 s for slurry 1 (a), slurry 2 (b), and slurry 3 (c)

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Fig. 7

Variation of moment and the roll motion for A=10deg and T=4 s

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Fig. 8

Variation of moment and the roll motion for A=7deg and T=4 s

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Fig. 9

Variation of moment and the roll motion for A=10deg and T=1.57 s

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Fig. 10

Snapshots of the free surface for slurry 1 in one period when A=10deg and T=4 s

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Fig. 11

Snapshots of the free surface for slurry 2 in one period when A=10deg and T=4 s

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Fig. 12

Snapshots of the free surface for slurry 3 in one period when A=10deg and T=4 s

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Fig. 13

Snapshots of the free surface for slurry 3 in one period when A=7deg and T=4 s

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Fig. 14

Snapshots of the free surface for slurry 3 in one period when A=10deg and T=1.57 s

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