When waves from two weather systems converge at a certain sea area, cross waves can be produced. It is important to have a better understanding of the motion characteristics of ship in cross sea to ensure its navigation safety. In this paper, the motion responses of a S175 container ship hull in cross sea is first analyzed based on CFD technique using RANS method. VOF method is used to model and capture the free surface and overset grid technique is adopted to simulate ship motions in waves. Verifications on ship motion by the numerical method have been conducted for time step- and grid-independent studies. According to the motion results by numerical simulation, typical conditions are chosen for further investigation of slamming pressure on bow area and green water on deck. It is found that vertical motion responses of ship induced by cross waves can be quite large and the ship experienced obvious roll–pitch-coupled motion. Severe bow slamming and green water under cross sea state are also observed. The bow flare slamming pressure on the baseline can be quite large in symmetric cross wave. Asymmetrical slamming impacts occurred when the ship sails in an asymmetric cross wave field.

当来自两个气象系统的海浪在某个海域汇聚时，会产生横波。重要的是要更好地了解跨海船舶的运动特性，以确保其航行安全。本文首先基于CFD技术，运用RANS方法对一艘S175集装箱船在跨海航行中的运动响应进行了分析。使用VOF方法对自由表面进行建模和捕获，并采用过高网格技术来模拟船舶在波浪中的运动。已经通过数值方法对船舶运动进行了验证，以进行与时间和网格无关的研究。根据数值模拟的运动结果，选择典型条件进一步研究船首区域的砰击压力和甲板上的绿水。研究发现，由横波引起的船舶垂直运动响应可能非常大，并且船舶经历了明显的侧倾-俯仰耦合运动。在跨海状态下也观察到严重的船首砰击声和绿水。在对称横波中，基线上的船首耀斑撞击压力可能很大。当船舶在不对称的横波场中航行时，发生不对称的撞击冲击。