航行体近水面航行时会引起周围流场中流体的惯性运动，动能会随波浪扩散而耗散，航行体近水面运动时固有周期和幅值衰减率受水的影响可以用附加质量和阻尼系数描述。本文运用计算流体力学软件STAR-CCM+开展航行体近水面自由横摇与纵摇衰减运动的数值仿真，根据不同初始角度条件下仿真得到的自由衰减时历曲线，分别计算横摇与纵摇的附加质量与阻尼系数，并结合实际运动情况，对不同初始角度条件下附加质量与阻尼系数的变化成因分别进行分析。
When navigating near surface, underwater vehicle will cause inertial motion of the fluid in the surrounding flow field, and the kinetic energy, meanwhile, will be dissipated with the wave diffusion. It can be described by added mass and damping coefficient how water effects the natural period and amplitude attenuation velocity of the near surface vehicle. In this paper, the computational fluid dynamics software STAR-CCM+ is used to carry out the numerical simulation of free rollling and pitching attenuation motion of the near surface vehicle. According to the free attenuation time history curves obtained under different initial motion amplitudes, the added mass and damping coefficient of the roll and pitch can be calculated respectively. Combined with the actual motion, the causes of the changes of the additional mass and damping coefficient under different initial motion amplitudes are analyzed respectively.
