中文摘要：

基于计算流体动力学理论,结合重叠网格方法,对三维带舭龙骨船体的自由横摇衰减运动以及强迫横摇运动进行数值模拟研究.采用能量法处理船体自由横摇衰减运动时历,求取横摇阻尼,讨论了初始横摇角、模型缩尺比对横摇阻尼的影响.在此基础上进一步分析了船体强迫横摇运动的数值模拟结果,探讨了阻尼系数的频率相关性.将部分数值结果与试验值进行了比较,结果表明论文方法预报自由横摇衰减运动的自振周期以及横摇阻尼精度较高;横摇阻尼随初始横摇角增大而增大,相同初始横摇角下横摇阻尼的尺度效应较小,但频率相关性明显.

英文摘要：

Numerical simulations of decay of free and forced rolling motion of a 3D ship with bilge keel have been carried out based on computational fluid dynamics and with overset mesh method. Roll damping of the ship is obtained by means of energy method. Influences of initial roll angle and scale of the model on the roll damping are discussed respectively. A comparison between numerical and experiment results has been conducted, which shows that both natural period and roll damping of the ship can be well predicted. It is indicated that roll damping increases with initial roll angle, and is sensitive to the frequency of roll, but the scale effect is not significant.