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Research Papers: Offshore Technology

Effects of Water Inside Semiclosed Moon Pool on the Hydrodynamic Coefficients and Heaving Damping of a Truss Spar Platform

[+] Author and Article Information
Liqin Liu

State Key Laboratory of Hydraulic
Engineering Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: liuliqin@tju.edu.cn

Yu Qiu

State Key Laboratory of Hydraulic
Engineering Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: dtcqy@tju.edu.cn

Yan Li

State Key Laboratory of Hydraulic
Engineering Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: jgliyan@tju.edu.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 August 1, 2015; final manuscript received February 13, 2016; published online April 8, 2016. Assoc. Editor: Charles E. Smith.

J. Offshore Mech. Arct. Eng 138(4), 041302 (Apr 08, 2016) (8 pages) Paper No: OMAE-15-1079; doi: 10.1115/1.4032896 History: Received August 01, 2015; Revised February 13, 2016

The hydrodynamic coefficients and heaving damping of a truss spar platform were studied by the computational fluid dynamics (CFD) method with considering the semiclosed moon pool. A partial model was established to investigate the added mass and viscous damping of platform heaving; a full model and a simplified model were established to study the nonlinear damping of platform heaving. The influences of opening ratios of moon pool on the added mass and viscous damping of platform heaving were analyzed. It is found that the natural period and the heaving added mass of the platform increase if the semiclosed moon pool is considered. Different opening ratios of the moon pool will lead to different heaving damping of the platform and dynamic pressure acting on the guide plate of the moon pool. In practice, an optimal opening ratio of the moon pool can be designed. The numerical results were verified by comparing with the results of model experiments.

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Figures

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Fig. 1

Bottom form of the moon pool: (a) 0% opening ratio, (b) 30% opening ratio, and (c) 70% opening ratio

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Fig. 2

Numerical tank and models: (a) partial model, (b) full model, and (c) simplified model

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Fig. 5

Dynamic pressure: (a) 0% opening ratio, (b) 30% opening ratio, and (c) 70% opening ratio

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Fig. 4

Results of the damping coefficient Cd: (a) Vr=0, (b) Vr=0.055, and (c) Vr=0.11

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Fig. 3

Results of the added mass coefficient Ca: (a) Vr=0, (b) Vr=0.055, and (c) Vr=0.11

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Fig. 7

Platform motions in the static water calculated by the simplified model: (a) 0% opening ratio, (b) 30% opening ratio, and (c) 70% opening ratio

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Fig. 6

Platform motions in the static water calculated by the full model: (a) 0% opening ratio, (b) 30% opening ratio, and (c) 70% opening ratio

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