共振频率下油船液舱晃荡数值模拟研究

Numerical simulation of tank sloshing at resonance frequency

为了解共振频率下油船液舱舱内液体的晃荡情况,文章建立三维晃荡模型及数值计算模型,采用VOF法追踪自由液面,结合动网格技术,模拟共振频率下油船液舱舱内原油的晃荡情况。结果表明,左舱壁自由液面波高不断增加,在第3个周期内左舱壁处自由液面波高达到最大值,即发生冲顶现象,往后每个周期波高呈规律变化;晃荡前期(前2个周期),舱内原油是以驻波的运动方式在舱内运动,待晃荡到达稳定状态后舱内原油以驻波与行进波组合的组合波作为舱内原油的运动方式;通过比较舱壁不同点处的晃荡压力,得出自由液面以下距自由液面远的晃荡压力越大,自由液面以上舱壁的晃荡压力最小。

In order to understand the sloshing of liquid in tank at resonance frequency,a three-dimensional sloshing model and a numerical calculation model are established.The free liquid surface is tracked by VOF method,and the dynamic grid technique is used to track the free liquid surface.The sloshing of crude oil in tank is simulated at resonance frequency.By comparing the sloshing pressure at different points of bulkhead,it is concluded that the higher the sloshing pressure is from the free liquid surface to the free liquid surface,the smallest is the sloshing pressure of the bulkhead above the free liquid level.