In the light of the advantages and disadvantages of the level-set method and VOF method, a new coupling method of the liquid interface tracing named CLSVOF (Coupled Level-Set and Volume-of-Fluid method) has been proposed in recent years. By means of this method, this paper realizes the conservation of physical quantities in the calculation process compared with the level-set method, and overcomes the difficulty of accurately calculating the interface normal and curvature in comparison with the VOF method. Specifically, the above method is utilized in this paper to numerically simulate the sloshing of a liquid tank and its results are compared with the experimental results. It is found that the results agree with each other, which verifies the validity and accuracy of the CLSVOF method. Afterwards, this paper takes the liquid cargo tank of a large LNG-FSRU (Liquefied Natural Gas-Floating Storage Regasification Unit) as its research object to conduct a threedimensional numerical simulation of rolling motion and study the influence of the excitation centre on the sloshing of the liquid tank. It turns out that the position of the excitation centre affects the movement of the free surface and the pressure distribution of the tank. Meanwhile, research on the position of the excitation centre provides the theoretical foundation for designing the marine structure of the octagonal tank.
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