水下爆炸冲击波产生的区域空化效应二次加载的并行数值研究  

Parallel computation of bulk cavitation reloading on a surface vessel subjected to underwater shock

作　　者：叶帆[1] 宗智[1] 李海涛[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室船舶与海洋工程学院,辽宁大连116024

出　　处：《舰船科学技术》2011年第9期11-17,共7页Ship Science and Technology

基　　金：创新研究群体科学基金(50921001);国家重点基础研究发展计划项目(2010CB83270)

摘　　要：船舶等水面结构受到水下爆炸作用时,其附近水域会产生空化现象,包括局部空化和区域空化。以某水面船为对象,数值模拟了该船受水下爆炸作用时的动态响应。比较了考虑空化效应和不考虑空化效应下船体结构的不同响应,分析了区域空化效应对此船的二次加载作用,二次加载引起的加速度峰值与冲击波引起的加速度峰值在同一量级上。使用高性能计算机并行计算比较了不同流体网格密度模型的计算结果。结果对比显示,为了更精确地模拟空化效应及其对结构的影响,加密水域网格是必要的。Cavitation,including local cavitation and bulk cavitation,can occur in water area near the surface ships subjected to underwater shock.Dynamic response of a surface ship subjected to underwater explosion is simulated.The response of the hull structure considering cavitation is compared with the structural response without cavitation effects.The secondary loading on the ship caused by bulk cavitation is analyzed.Simulation results show the peak values of acceleration caused by shock wave and reloading are of the same order.The effect of fluid element size on cavitation calculation is investigated by using parallel computers.For simulating cavitation and its effect on structures more accurately,smaller fluid elements are required.

关 键 词：水下爆炸 区域空化效应 二次加载 数值模拟 并行计算 

分 类 号：U674.703[交通运输工程—船舶及航道工程]