方形波浪中船舶运动特性及安全航行策略

为了研究船舶在多向波与单向波中运动响应的差异性，基于计算流体动力学(CFD)方法和流体体积法（VOF）造波技术建立方形波浪的数值模拟方法. 采用动量源方法和强迫波力进行波浪叠加模拟方形波浪，采用重叠网格技术和动态流体物体相互作用（DFBI）模块研究S175船型在不同参数方形波浪中的运动响应，并将船舶在双向波浪和单向波浪中的运动响应进行对比分析，探究船舶在方形波浪场中不同航线下的运动特性. 研究表明，在大部分工况下，方形波浪中的船舶运动响应及甲板上浪较单向波浪中的大幅增加，其中船舶在方形波浪中出现明显的横摇运动，但合理选择航行路线可以使得船体运动及甲板上浪显著降低，从而提高船舶在方形波浪中的航行安全性, 为船舶遭遇方形波浪时的安全航行提供建议.

Ship motion responses in cross wave and related safe navigation strategy

A cross wave simulation method by computational fluid dynamics (CFD) method and volumn of fluid (VOF) wave-making technique was established to study the difference of ship motion responses in multi-directional and uni-directional waves. The momentum source method and wave forcing were used to superimpose waves to simulate cross wave. The motion behavior of a S175 ship in cross waves with different wave parameters was studied using overset mesh technique and dynamic fluid body interaction (DFBI) module. The ship motion responses in bi- and uni-directional waves were comparatively analyzed and the motion characteristics of ships on different navigational routes in a cross wave field were analyzed. Results indicate that the motion responses and green water on deck in bi-directional waves are generally much greater than those in uni-directional waves. And, the ship has obvious roll motion in cross waves. However, ship motions and green water on deck can be largely reduced by adopting the reasonably optimized navigational route and strategy, which would improve the navigation safety of the ship in cross waves and provide suggestions for the sailing safety when the ship encounters cross waves.