液舱晃荡是一种非常复杂的流动现象,会产生自由移动液面的大变形和流体飞溅现象,具有强烈的非线性和随机性.随着LNG液货船的大型化发展,液舱晃荡现象所产生的极大的抨击力严重威胁着船舶的安全,如何改善液舱晃荡现象也成为亟需解决的工程问题之一.鉴于液舱晃荡问题的特殊性,传统网格法往往会因为网格大变形而导致模拟的失效.因此,本文采用一种改进的基于拉格朗日粒子的MPS方法,在通过模拟液舱横摇晃荡验证其有效性的基础上,针对液舱壁面的抨击压力和自由液面的波高变化,探究了不同高度挡板对改善液舱晃荡现象的机理和规律.“,”Sloshing is a phenomenon with complex fluid-structure interaction as a result of the mov-ing free surface and large deformation, which is characterized with strong nonlinearity and high ran-domness. With the development of large liquid cargos, hull structure stability and strength are high-lighted in various engineering areas due to tank sloshing partially filled with liquid. Because of the specific characteristic of liquid sloshing, the traditional mesh methods will always fail in the simula-tion as a result of large mesh deformation. As such, the paper adopts improved MPS method which is based on Lagrange particles. The improved MPS method is first verified by simulating rolling motion of the liquid tank. On the basis, the mechanism and laws of different height baffles to improve the phe-nomenon of liquid tank sloshing are investigated in the light of the pressure of attack on the wall and the wave height of the free surface.