针对三维方形浮式储油卸油装置(FPSO)海上浮式结构，基于计算流体力学理论，采用重叠网格技术，计及自由面影响，求解雷诺平均方程，对其自摇衰减运动和强迫摇荡运动进行数值模拟.对 DTMB5512 裸船体自由横摇衰减运动进行模拟，将计算结果和试验数据对比；同时对尺度效应以及网格相关性进行比较分析，验证方法的可靠性.根据计算结果提出结构修改方案，计算各方案相同幅值相同频率下平台强迫摇荡阻尼系数，为工程上的结构设计提供依据.
Based on computational fluid dynamic theories，the simulations of roll decay and forced roll motion of a three dimensional rectangle floating production storage offloading, a new concept ocean floating structure, were carried out by using overset mesh technology and solving Reynolds Averaged Navier-Stokes equations with the consideration of free surface effect. In addition, the scale factor and gird study verification were considered. Energy method was adopted to compute the roll decay damping coefficients. To verify the methods, a roll decay motion was predicted for a surface combatant. The results show a good agreement with the experimental data. And then a series of prescribed roll motions on various amplitudes and frequencies of different modifications to origin design were executed due to its lack of roll stability.
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