基于CFD-DEM方法的回转体水下运动兴波破冰数值模拟研究
Numerical Simulation of Ice Breaking Capacity of a Rotating Body Moving Underwater Based on CFD-DEM Method
倪宝玉 1谭浩 1李鸿远 2周朔1
作者信息
- 1. 哈尔滨工程大学船舶工程学院,哈尔滨 150001
- 2. 中国船舶集团渤海造船有限公司,葫芦岛 125000
- 折叠
摘要
该文采用CFD-DEM方法对回转体水下运动兴波破冰问题进行了数值模拟研究,探究回转体运动速度、潜深对破冰效果的影响,对比分析了不同工况下冰盖的裂纹扩展规律和破坏程度,其中速度无因次化为弗劳德数Fr,潜深无因次化为回转体深度与回转体最大直径的比值,记作h.研究结果表明:在回转体运动兴波破冰过程中,回转体中后部冰盖的破坏情况较为严重;随着回转体的运动,冰盖裂纹向前扩展,出现新的纵向裂纹与横向裂纹,待裂纹完全发展后,冰盖呈现出以横向裂纹为主的破坏形式;存在临界速度Ccri,当回转体的运动速度处于临界速度附近时,冰盖的破坏效果较好,对应的速度区间为Fr=0.55～0.75;随着回转体潜深增大,冰盖破坏程度总体呈现出下降趋势,h＞3.43后,冰盖不再发生明显破碎.
Abstract
In this article,a numerical simulation research is conducted on the problem of ice breaking for the waves generated by underwater motion of a rotating body using the CFD-DEM method.The influence of the speed and depth of a rotating body on the ice breaking effect is explored,and the crack propagation law and damage degree of the ice sheet under different conditions is analyzed.The speed is dimensionless as the Froude number Fr,and the depth is dimensionless as the ratio of the depth of the rotating body to the maximum diameter of the rotating body,denoted as h.The research results show that during the process of ice breaking caused by the rotating body,the damage to the ice sheet above the middle and rear parts of the rotating body is more severe.As the cracks on the ice sheet propagate forward,new longitudinal and transverse cracks appear.After the cracks fully develop,the ice sheet presents a failure form dominated by transverse cracks.The concept of critical velocity Ccri exists,and when the velocity of the rotating body is near the critical velocity,the destruction effect of the ice sheet is better,with a corresponding velocity range of Fr=0.55～0.75.In general,the degree of damage to the ice sheet decreases as the position of the rotating body becomes further from the ice.When the value of h is greater than 3.43,the ice sheet no longer undergoes significant fragmentation.
关键词
破冰/水下运动/CFD-DEM方法/可破碎冰盖Key words
Ice breaking/Underwater motion/CFD-DEM method/Broken ice sheet引用本文复制引用
基金项目
国家自然科学基金(52192693)
国家自然科学基金(52192690)
国家自然科学基金(51979051)
国家自然科学基金(51979056)
国家自然科学基金(52371270)
国家自然科学基金区域联合基金(U20A20327)
国家重点研发计划(2021YFC2803400)
出版年
2024
NETL
NSTL
万方数据