Even in relatively calm waters, low amplitude wave-induced motions of an LNG carrier may induce large amplitude liquid sloshing inside the ship's partially filled tanks, and the interaction between ship motions and sloshing may affect the ship's seekeeping properties. A computational procedure, here referred to as the RANS-RANS method, was developed to account for this interaction, and this method was then employed to predict the free surface flow inside the tanks and the corresponding motions of the ship in regular head and beam waves. This method coupled a compressible VoF technique with a generic wave generation and absorption scheme to obtain wave-induced ship motions with and without considering the effects of sloshing in the ship's tanks. Systematic grid studies were performed to obtain a sufficiently fine grid needed to yield converging predictions. The resulting wave patterns, ship motions, and internal sloshing elevations were compared with results obtained from a computational method, here referred to as the RANS-BEM method, that relied on a boundary element method to obtain ship motions. This RANS-RANS method was validated against model test measurements.

即使在相对平静的水域中，LNG运载工具的低振幅波引起的运动也可能在船舶部分填充的油舱内引起大振幅的液体晃动，并且船舶运动与晃动之间的相互作用可能会影响船舶的维护性能。开发了一种计算程序，这里称为RANS-RANS方法，以解决这种相互作用，然后采用此方法来预测液舱内的自由表面流以及规则的头波和束波中船的相应运动。这种方法将可压缩的VoF技术与通用的波浪产生和吸收方案结合在一起，可以在不考虑船舱内晃荡影响的情况下获得波浪引起的船舶运动。进行了系统的网格研究，以获得产生收敛预测所需的足够精细的网格。将所得的波型，船舶运动和内部晃动标高与通过计算方法（这里称为RANS-BEM方法）获得的结果进行比较，该方法依靠边界元法获得船舶运动。此RANS-RANS方法已针对模型测试测量进行了验证。