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

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Liqin Liu ◽  
Yu Qiu ◽  
Yan Li
Keyword(s):  
Dynamic Pressure ◽  
Added Mass ◽  
Viscous Damping ◽  
Hydrodynamic Coefficients ◽  
The Moon ◽  
Spar Platform ◽  
Natural Period ◽  
Truss Spar Platform ◽  
Truss Spar ◽  
Moon Pool

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.

The Added Mass and Viscous Damping of a Spar Platform With Semi-Closed Moon Pool

2015 ◽  
Author(s):  
Li-qin Liu ◽  
Jin-shuang Man ◽  
Yu Qiu
Keyword(s):  
Three Dimensional ◽  
Added Mass ◽  
Viscous Damping ◽  
The Moon ◽  
Spar Platform ◽  
Natural Period ◽  
Platform Motion ◽  
Static Water ◽  
Three Dimensional Models ◽  
Moon Pool

The CFD (Computational Fluent Dynamics) method was used to calculate the added mass and the viscous damping of the Spar platform considering the semi-closed moon pool in this paper. The three-dimensional models of the platform with water inside the semi-closed moon pool were established by the VOF (Volume of Fluid) method. The UDF (User Defined Function) was adopted to oscillate the platform. The added mass and the damping coefficients were calculated under different KC (Keulegan-Carpenter) number and flow velocity for different opening ratio of the moon pool. The viscous damping and natural period of the platform heaving were obtained by calculating the platform motion in the static water. The influences of water inside the moon pool on the Spar platform motion were analyzed.

Analysis of heave motions of a truss spar platform with semi-closed moon pool

2014 ◽  
Vol 92 ◽  
pp. 162-174 ◽  
Author(s):  
Liqin Liu ◽  
Atilla Incecik ◽  
Yongheng Zhang ◽  
Yougang Tang
Keyword(s):  
Spar Platform ◽  
Truss Spar Platform ◽  
Truss Spar ◽  
Moon Pool

Sensitivity Analysis of Different Parameters of Taut Mooring System of a Truss Spar

2019 ◽  
Author(s):  
Zhuang Kang ◽  
Rui Chang ◽  
Youwei Kang ◽  
Shanchuan Liu
Keyword(s):  
Design Parameters ◽  
Mooring Line ◽  
Main Body ◽  
Mooring System ◽  
Spar Platform ◽  
Truss Spar Platform ◽  
Hole Position ◽  
Line Force ◽  
Truss Spar ◽  
Nonlinear Solutions

Abstract The taut mooring system is widely used for some advantages, such as smaller mooring radius, lighter total weight and better anti-corrosion performance. In this paper, the taut mooring system of a Truss Spar platform which was taken as the research object was investigated under the condition of 2000 m water depth in South China Sea. Firstly, the main body of the platform was analyzed in frequency domain based on the 3-d potential theory, and then the nonlinear solutions of platform displacement and mooring line force were obtained by using coupling analysis method in time domain, which determined the preliminary design parameters of mooring system. The sensitivity of the taut system is studied by changing several design parameters such as the top angle of mooring line, cable hole position and method of mooring disposal. In summary, the variation of the motion and dynamic response of the platform and mooring system has been explored and summarized by studying the design process and influential parameter of dynamic characteristics of mooring system and optimizing ideas of relevant parameters, which can further provide technical support and engineering reference for the design and application of the taut mooring system of deepwater Truss Spar platforms.

Stochastic Analysis to Truss Spar Platform in Deep Sea

2013 ◽  
Vol 477-478 ◽  
pp. 809-812
Author(s):  
Yan Wang ◽  
Rui Gao ◽  
Ling Qiang Yang
Keyword(s):  
Numerical Method ◽  
Deep Sea ◽  
Stochastic Analysis ◽  
Numerical Results ◽  
Model Parameters ◽  
Regular Waves ◽  
Spar Platform ◽  
Truss Spar Platform ◽  
Wave Basin ◽  
Truss Spar

Truss spar model was tested using regular waves in a wave basin and the responses in surge, heave and pitch were measured. A program was developed to determine the responses using numerical method. This program was run using the model parameters. The results are agreed well with the corresponding results obtained from the test measurements. Then this program was applied to a prototype spar simulated results were compared with the corresponding numerical results and test measurements.

Identification of slow drift motions of a truss spar platform using parametric Volterra model

2015 ◽  
Vol 109 ◽  
pp. 654-668 ◽  
Author(s):  
Edwar Yazid ◽  
Mohd. Shahir Liew ◽  
Setyamartana Parman ◽  
Velluruzhatil John Kurian
Keyword(s):  
Volterra Model ◽  
Spar Platform ◽  
Truss Spar Platform ◽  
Slow Drift ◽  
Truss Spar

Responses of Concrete Truss Spar Platform in Deep Wave

2013 ◽  
Vol 431 ◽  
pp. 182-185
Author(s):  
Qing Lian Shu ◽  
Lu Ling Yang ◽  
Rui Gao ◽  
Ling Qiang Yang
Keyword(s):  
Numerical Method ◽  
Regular Waves ◽  
Spar Platform ◽  
Truss Spar Platform ◽  
Wave Basin ◽  
Truss Spar

Concrete truss spar model was tested using regular waves in a wave basin andthe responses in surge, heave and pitch were measured. A program was developed to determine the responses using numerical method. This program was run using the modelparameters. The results are agreed well with thecorresponding results obtained from the test measurements. Then thisprogram was applied to a prototype sparsimulated results were compared with the corresponding numericalresults and test measurements.

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