The present work is about the estimation of sloshing loads in partially filled tanks of large LNG carriers. Since sloshing model tests with 1/55 scale membrane-type tank had been carried out for regular harmonic motions to investigate various characteristics of impact pressures, numerical simulations were performed and validated for the same cases. Additionally, pressure distributions along the tank wall at critical fill levels were obtained, which provide references for LNG containment design and strength assessment. The numerical method was validated against the experimental results.%大型LNG船液舱晃荡冲击载荷的合理预报是液舱结构安全性设计和评估的基础.针对部分装载的LNG船液舱的晃荡载荷开展数值预报方法研究,建立了合理的数值模型和计算方案.通过典型菱形液舱的三维晃荡模型试验,获得LNG液舱在各种运动模式下流体拍击舱壁的冲击载荷特性.在数值计算和对比分析中,首先对舱内液体在各种运动模式下的晃荡固有频率进行了搜索,然后在各个固有频率下进行了变幅值激励和耦合运动激励下的冲击压力计算,得到了不利运动工况下的冲击压力预报结果.数值模拟结果与模型试验结果的比较表明,提出的液舱晃荡数值计算方法能够合理地预报大型LNG船液舱晃荡载荷特征.在此基础上,对各种载液水平和运动模式下大型LNG船液舱内壁的压力分布进行了详细计算,可供液舱围护系统结构设计和安全性评估参考.
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