欢迎光临《计算力学学报》官方网站！

Influence of ice floe size on ice resistance of ship hull in broken ice field based on discrete element analysis

DOI：

 作者 单位 邮编 季顺迎* 大连理工大学工程力学系 116024

船舶在碎冰区航行时的冰阻力会影响船舶的安全性和航行性能。本文以“雪龙”号破冰船为研究对象，采用三维离散元方法对碎冰环境下船体结构冰阻力进行数值模拟。基于随机生成算法对不规则形状的碎冰区进行参数化建模以形成复杂的碎冰初始场，同时考虑了海水对船体结构的作用力建立船体碎冰阻力的计算模型，并将离散元计算结果与碎冰区Dubrovin冰阻力计算公式进行对比。在此基础上将冰块尺寸进行无量纲化，研究不同冰厚和航速下冰块尺寸对碎冰阻力的影响规律。以平整冰区船体冰阻力的Lindqvist公式为参照，得到碎冰向层冰转化的临界尺度。该浮冰临界尺寸可作为识别碎冰区与平整冰的判据。本文研究工作可为船舶在极地冰区的安全航行提供一定的参考。

The ice resistance affects the safety and navigation performance of the ship when sailing in the broken ice field. In this paper ,the icebreaker Xuelong is taken as the research object, The three-dimensional discrete element method(DEM) is used to numerically simulate the ice resistance of ship structures in broken ice field. Based on random generation algorithm, the irregularly shaped area of broken ice is modeled to form a complex broken ice initial field. At the same time, considering the force of seawater on the hull structure, the calculation model of the broken ice resistance of the hull is established . And the DEM results are compared well with the Dubrovin equation for ice resistance in broken ice field. Based on the DEM simulated results, the ice size is dimensionless, and the influence of ice size on broken ice under different ice thickness and speed is studied. Based on the Lindqvist formula of hull ice resistance in flat ice region, the critical scale of the transformation from broken ice to layer ice is obtained. The critical size of floe ice can be used as a criterion to identify the broken ice area and flat ice. The research work in this paper can provide a certain reference for the safe navigation of ships in the polar ice region.
查看/发表评论  下载PDF阅读器