基于VOF法的不同形状液舱晃荡数值模拟

Numerical simulation of sloshing in tanks with different shapes based on VOF method

以水下航行器水平液舱内的液体晃荡问题为研究对象,基于VOF方法建立二维水平液舱数值模型,研究不同外部激励对液舱晃荡造成的响应。通过仿真计算2种特殊工况下自由液面的晃荡状态,分析数值仿真模拟和文献结果的误差,证明了模型计算的精确性。在矩形液舱计算的基础上,进一步对和海洋工程实际形状类似的半圆-矩形液舱进行模拟分析。通过计算分析各个影响参数对液舱晃荡的影响,得到压载水舱内的波高历时曲线以及舱壁上某监测点处的压力时间曲线。数值模拟计算的结果误差较小,为减小晃荡对水下航行器的影响提供了理论依据。

Taking the liquid sloshing problem in the horizontal tank of an underwater vehicle as the research object, a two-dimensional horizontal tank numerical model is established based on the VOF method to study the response of different external excitations to the tank sloshing. The sloshing state of the free liquid surface under two special working conditions is calculated by simulation, and the errors of numerical simulation and literature results are analyzed, which proves the accuracy of the model calculation. Based on the calculation of the rectangular tank, the simulation analysis of the semi-circularrectangular tank similar to the actual shape of ocean engineering is further carried out. According to calculation, Analyzing the influence of each influencing parameter on tank sloshing, the wave height duration curve in the ballast tank and the pressure time curve at a monitoring point on the bulkhead are obtained. There exist small numerical simulation’s error, it provides a theoretical basis for reducing the impact of sloshing on the underwater vehicle.