MPS方法数值模拟减摇水舱晃荡流动问题

Numerical simulation of liquid sloshing in anti-roll tank by MPS method

船舶六自由度运动中,横摇对船舶的安全性影响十分严重。船舶在设计建造时,常采用减摇装置来降低横摇运动对船舶安全的危害。其中,减摇水舱因其结构简单、经济、便于养护,且在低航速和无航速情况下仍能发挥作用而得到广泛应用。为对减摇水舱的减摇特性进行深入研究,该文采用基于半隐式移动粒子MPS方法开发的MLParticle-SJTU求解器,对三维矩形被动式减摇水舱的晃荡进行了数值模拟。首先,进行了减摇水舱和舱内液体晃荡在外界激励下耦合运动的模拟,并将模拟结果与空舱横摇情况进行对比,证明了减摇水舱的减摇效果。然后,将减摇水舱横摇角的历时变化曲线与实验结果进行对比,验证了MPS方法的适用性与可靠性。最后,分析了减摇力矩与外界激励力矩之间的相位差,解释了减摇水舱的工作原理。

In present paper, the in-house mesh-less solver MLParticle-SJTU, based on the improved MPS(moving particle semi-implicit) method, is employed to simulate the three-dimensional liquid sloshing in the passive rectangular anti-roll tank and investigate its damping characteristics. The roll motion amplitude of anti-roll tank, obtained from MPS simulation, largely decreases compared with empty tank, confirming the damping effect of anti-roll tank. The MPS results show good agreement with the experimental results in literature, validating the applicability and reliability of MPS method in researches on anti-roll tank.Furthermore, the phase difference between the damping moment and the external excitation moment is analyzed, and the anti-roll principle can be explained by the phase difference.