基于MPS方法的对称水平挡板液舱晃荡研究

Investigation on liquid sloshing with symmetrical horizontal baffles based on moving particlesemi-implicit method

液舱晃荡是一种舱内液体受到激励而产生晃动的现象。晃荡会对壁面产生巨大的冲击压力,这不仅会导致舱壁结构的损坏,也会影响船舶的稳定性,甚至在严重时导致船舶倾覆。这种现象普遍存在于船舶与海洋工程中,特别是随着大型LNG船的发展,如何改善液舱晃荡现象成为亟待解决的难题。由于液舱晃荡具有很强的非线性和随机性,是一种非常复杂的自由液面流动问题,因此本文首先建立用于验证MPS方法的二维液舱模型,验证了MPS方法的正确性。随后介绍了坐标转换,建立了用于数值模拟的带有对称水平挡板的液舱模型,最后通过改变挡板的高度和宽度探究对称水平挡板对液舱减晃的效果,旨在为船舶与海洋工程提供一定的理论依据。

Liquid tank sloshing is a phenomenon that the liquid in the tank will be excited to fluctuate under the external load.The sloshing will produce a huge impact pressure on the wall,which may not only lead to the damage of the bulkhead structure,but also will affect the stability of the ship,even resulting in the capsizing of the ship at the worst.It is very necessary to investigate how to improve this phenomenon,especially with the development of large LNG ships.Liquid sloshing is characterized with large deformation of the free surface which is strongly nonlinear and random,so a particle first establish a two-dimensional liquid tank model used to verify the MPS method.Subsequently,the coordinate conversion is introduced,and the liquid compartment model with symmetrical horizontal baffle used for numerical simulation is established.Finally,the effect of symmetrical horizontal baffle on the liquid tank is explored by changing the height and width of the baffle,aiming to provide a certain theoretical basis for ship and ocean engineering.