两船在波浪中耦合运动的三维频域理论研究

本文采用三维势流理论求解两船在波浪中相互干扰的耦合运动。基于源分布方法，两船船体表面被划分成若干面元，在每一面元上进行等源强分布。为了验证该理论以及算法的可行性，计算了有限水深中两圆柱的水动力干扰，其数值计算结果与其他理论结果吻合较好。其次计算了两船在波浪中无航速与有航速情况的水动力干扰，其结果与单船结果以及双船试验结果进行比较。同时深入研究了纵横向间距以及航速变化对水动力干扰的影响，得出间距与航速不仅是水动力干扰的重要参数，而且对两船中的小船影响尤为重要。本文的研究提出了一种有效而又简单的方法预报两船在波浪中的耦合运动，为分析海上航行补给所涉及的水动力问题提供了有效的手段。

Coupled Motions of Two Ships in Waves on 3D Method

A 3D potential flow theory is carried out to solve the wave-induced coupled motions between two ships. Generally the formulation is based on the source distribution technique, by which each ship hull surface is regarded as the assembly of many panels. In order to verify the present 3D method,two circular cylinders' interactions in finite depth of water were considered and results obtained with our code were compared with published results. Numerical results are presented for the coupled motions of the smaller ship without and with speed. Comparisons are made with the behavior of the mono-hull and the experimental results.The interaction effects of speed and different clearance including the longitudinal and lateral separation distance are deeply investigated. It is found that the effect of clearance and speed are important factors relating to the interaction effect which is especially significant to the smaller ships. The present study gives an efficient and simple tool to predict coupled motions of two moving ships and will be helpful to analyze the problems of underway replenishment at sea.