基于重叠网格的两船间水动力干扰计算

Numerical simulation of hydrodynamic interference between two vessels based on overlapped grids

船舶在实施靠泊、补给等操作时波浪中近距离两船或多船之间的水动力性能和干扰问题不容忽视。本文采用基于雷诺平均方程的方法对波浪中两船间的水动力干扰进行数值计算,应用STAR-CCM+软件模拟数值水池中的规则波造波和消波过程,分析规则波中两船在不同波长和不同横向间距条件下的横摇、垂荡运动响应特性以及横向力、垂向力等受力特性的变化规律。结果表明,当波长与船长的比值λ/L在0.5~1范围内变化时,两船所受的横向力和垂向力随波长的变化存在突变现象;当λ/L>1.5时,两船受力的变化较为平缓。在入射波波长λ一定的情况下,随着两船间距S/L的增加,两船的横向力和垂向力呈现先增大后减小的趋势,两船的横向力和垂向力分别在S/L=0.35和0.45时达到最大值。研究结果可为波浪中多浮体间的安全作业等提供数据基础。

Activities such as berthing,replenishment,rescue and other activities are becoming more and more common.The disturbance and hydrodynamic performance caused by short distance operation of ships cannot be ignored.In this paper,the method based on Reynolds-averaged equations is used to calculate the hydrodynamic disturbances between two ships in waves,the STAR-CCM+software was used to simulate the wave generation and wave absorption of regular wave,the motion response characteristics and force characteristics of the two vessels in regular wave under different wave lengths and transverse distances were analyzed.The results show that when the ratio of wavelength to ship lengthλ/L varies from 0.5 to 1,the lateral force and vertical force suffered by both ships have a sudden change with the wavelength,and when theλ/L is greater than 1.5,the forces of two ships change little.When the wavelength of incident wave is constant,the lateral force and vertical force of the two ships increase first and then decrease with the increasing of the distance between two ships.The results of this paper can be the basis for the safe operation among multiple floating body system in waves.