基于RANS和非线性动力学方法的海洋平台供应船水舱减摇预报（英文）

Roll Motion Prediction of PSV with Anti-rolling Tank Based on RANS and Nonlinear Dynamic Method

在探讨带平面被动式减摇水舱的海洋平台工作船在横浪中的减摇问题上,采用RANS方法进行船舶和水舱的强迫运动模拟,通过数值处理得到船舶和水舱的水动力系数。假设在共振频率下船舶和水舱的横摇运动在达到稳态后可以解耦,由非线性动力学的方法求解船舶横摇运动,并在波浪中进行系列模型试验以研究减摇特性。海洋平台工作船具有多工况的特点,不同载况对应不同船舶固有周期,实际航行中对减摇水舱的使用就是通过改变水舱水深使水舱的周期等于船舶固有周期,而通过上述方法的快速计算,选择合适的水深和阻尼隔板可以达到理想的减摇效果。结论表明该方法可以预报不同方案下的船舶横摇运动,该思路在船舶的减摇水舱设计阶段可以提供参考价值,并且在实船航行中可以提供水深加载指导以适应复杂的多工况航行。文中研究结果被运用于一艘实船航行时水舱加水策略中。

This work discusses the rolling motion in beam waves of a Platform Supply Vessel （PSV） with a rectangular passive anti-rolling tank （ART）. CFD method based on RANS was used to simulate the forced roll motion and obtain the hydrodynamic coefficients of the ship and the tank. Based on the assumption that the roll motions of ART and ship could be decoupled at resonance frequen- cy, a nonlinear dynamics method was applied to solve the rolling motion equation. PSV is characterized with multiple roll motion periods, due to its capability to work at different working conditions. It is crucial to the period of ART to match the natural period of ship in seaway. This can be achieved by adjusting filling level in the ART. Furthermore, roll motion model tests of this PSV with different ART forms in beam waves were performed. Results indicate that this theoretical approach could predict different cases of ship roll motion with ART, and is useful to design the ART of a ship. Based on this study, a strategy for adjusting water depth in ART is proposed and applied in the real ship.