ABSTRACT

In the present research, the three-dimensional (3D) time-domain hybrid Green function method is developed for simulating the coupled motions of two floating bodies with the side-by-side arrangement in waves. The fluid domain is decomposed into an inner and an outer domain by an imaginary control surface. Then, the Rankine source is adopted in the inner domain, while the transient time domain Green function is adopted in the outer domain. The side-by-side problem is numerically solved by means of the continuity condition adopted on the control surface. A Wigley hull ship and a rectangular barge with the side-by-side arrangement in beam wave are investigated, while the hydrodynamic interactions between them are taken into consideration. Based on that, the coupled motions in waves between a supply ship and frigate both with large flare, as well as with same forward speed and side-by-side arrangement are also investigated. A good agreement is obtained between numerical and experimental results for all case studies, which indicates that the present method and developed time-domain numerical solver is accurate enough and available to handle the side-by-side problem in ship and ocean engineering.

摘要

在本研究中，开发了三维（3D）时域混合格林函数方法，用于模拟两个并排排列的浮体在波中的耦合运动。流体域被虚构的控制表面分解为内部和外部域。然后，在内部域中采用朗肯源，而在外部域中采用瞬态时域格林函数。并排问题是通过控制面上采用的连续性条件在数值上解决的。研究了威格利号船和矩形驳船在水流中并排布置的情况，同时考虑了它们之间的流体动力相互作用。基于此，补给船和大型护卫舰之间的波浪运动相互耦合，以及相同的前进速度和并排布置也进行了研究。在所有案例研究的数值和实验结果之间都取得了很好的一致性，这表明本方法和开发的时域数值求解器足够准确，可用于处理船舶和海洋工程中的并行问题。