基于VOF和浸入边界法的黏性二相流模型对LNG液舱晃荡的数值模拟

摘要

A viscous two phase flow model based on the Volume of Fluid ( VOF) method and Immersed Boundary Method (IBM) is used in this research to numerically simulate sloshing problem occurred in the LNG tank (prismatic tank). The whole computational domain is rectangular, and VOF method is used for tracking and updating the free surface, immersed boundary method for boundary processing. A block up coefficient is used for the processing of volume fraction F so that VOF can process the bevel edge boundary. Finally the whole process of the sloshing tank motion, and compare the liquid surface height achieved is achieved by different methods. This study has reference value to this type of sloshing motion.%采用基于Volume of Fluid(VOF)方法和浸入边界法的黏性二相流模型对LNG液舱(棱形液舱)的晃荡问题进行数值模拟.黏性二相流模型采用一套控制方程进行处理.整个计算区域为矩形,自由液面的跟踪和更新采用VOF方法,斜边边界的处理考虑用到浸入边界法,把边界以外的当成是固体,在对VOF中的体积分数F的处理时引入通度系数以适应斜边边界.最后模拟得到液舱横荡的运动过程,对研究这一类型的晃荡运动具有参考价值.