采用耦合水平集和流体体积(CLSVOF)界面捕获方法对浮式生产储卸油(FPSO)装置矩形清洗舱内三层液体的晃荡特性进行数值分析；通过对比数值模拟与试验所得矩形舱内三层液体的液-液界面形状和高度的变化情况，验证了CLSVOF方法模拟多层液体晃荡特性的准确性.结果表明，多层液体晃荡过程中出现的物理现象远比传统单层液体晃荡中的复杂.当矩形舱外部激励频率等于液-液界面的最低阶固有频率时，所产生的共振效应不仅会导致液-液界面的晃荡幅度远大于自由表面的晃荡幅度，而且会导致液-液界面产生Kelvin-Helmholtz不稳定性.
In the present study, the coupled level set and volume of fluid (CLSVOF) interface capturing method is employed to investigate the three-layer liquid sloshing in a rectangular wash tank installed aboard floating production storage and offloading (FPSO). The study shows that in the case of multi-layer liquid sloshing, the relevant physics can be much more complicated compared with the single liquid sloshing case. When the forced oscillation frequency is slightly away from the resonant frequency, there is an interesting phenomenon that the internal sloshing between liquid-liquid interfaces is significantly more pronounced than the actual oscillation of the top free surface. Another important issue for multi-interface problems is Kelvin-Helmholtz instability along the interface. Finally, the excellent capability of the CLSVOF method for multi-layer liquid sloshing simulation is validated by the qualitative comparisons of numerical and test results.
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