摘要
采用离散元模型对碎冰区海冰与船舶结构的相互作用进行了数值模拟。碎冰由三维圆盘单元构成,并考虑了其在海流作用下的浮力、拖曳力、附加质量;采用单元组合的方式构造了船体的简易模型。通过海冰与船体单元间的接触判断和接触力计算确定海冰与船体结构之间的相互作用。采用以上离散单元模型对不同冰速、冰厚、冰块尺寸、密集度条件下海冰与船体的动力作用过程进行了数值计算,并对比分析了不同海冰参数下冰对船体作用力的幅值。结果表明:冰对船体的作用力随冰厚、流速、密集度、冰块尺寸的增加而增大。本文工作可为冰区船舶的安全运行和结构设计提供参考。
The interactions between drifting pancake ice floes and moored ship are simulated with the Discrete Element Model（DEM）.The pancake ice floes are modelled with three-dimensional discrete elements by considering the buoyancy,drag force and added mass of current.The ship hull is constructed with combined discrete elements via certain overlaps.The interaction between ice floe and ship hull is determined through element contact detection and impact force calculation.With the discrete element method above,the dynamic ice forces on ship hull are simulated under various ice velocities,thicknesses,floe sizes and concentrations,respectively.It shows that the ice load increases with increasing current velocity,ice concentration and ice thickness.The present work can be consulted for the ship structure design and the safe navigation in ice field.
出处
《应用力学学报》
CAS
CSCD
北大核心
2013年第4期520-526,645,共7页
Chinese Journal of Applied Mechanics
基金
国家海洋公益性行业科研专项经费(2012418007
5016)
国家自然科学基金(41176012)
中央高校基本科研业务费专项资助课题(DUT12YQ02)
关键词
离散元方法
碎冰区
船体
冰力
discrete element method（DEM）
broken ice field
ship hull
ice load.
