减摇水舱晃荡运动数值模拟研究

减摇水舱是一种全航速下都能起到减摇效果的减摇装置,研究减摇水舱在晃荡运动过程中减摇力矩的变化规律,是一件很有意义的工作.首先,考虑到减摇水舱在晃荡运动的过程中水舱角的变化对阻尼系数的影响,将阻尼系数看作一个时变的函数;然后求解船舶-水舱系统横摇方程,计算不同频率简谐运动形式下,减摇水舱对于船舶提供的减摇力矩;最后应用CFD方法,对水舱在上述运动形式下的晃荡过程进行3D数值模拟,求得的减摇力矩与理论计算值比较吻合.该研究工作为减摇水舱减摇力矩的计算提供了一个新方法,同时也为下一步的研究奠定了理论基础.

Research on numerical simulation of sloshing motions for anti-rolling tank

The anti-rolling tank is the device that can play the anti-rolling effect for full service speed. It has great significance to study the variation rule of the restoring moment in the process of sloshing motion for the anti-rolling tank. First, considering the impact of the change of the tank angle of the anti-rolling tank in the process of sloshing motion, the damping coefficient is seen as a time-varying function. Then, the rolling equation of the ship-tank system is solved and the restoring moment provided by the tank at different frequencies of the harmonic motion is calculated. Finally, the 3D numerical simulation of the sloshing motions of the tank is carried out by the CFD method and the good agreement is obtained with the theoretical value for the calculation of the restoring moment. The research provides a new method to calculate the restoring moment and also lays a theoretical foundation for further study.