弹性板水下爆炸冲击载荷的修正虚拟流体方法分析  

Analysis of Impact Load on Elastic Plate in Underwater Explosions with Modified Ghost Fluid Method

作　　者：许亮[1] 冯成亮[2] 刘铁钢[2] XU Liang FENG Chengliang LIU Tiegang(China Academy of Aerospace Aerodynamics, Beijing 100074, China LMIB ＆ School of Mathematics and Systems Science, Beihang University, Beijing 100191, China)

机构地区：[1]中国航天空气动力技术研究院,北京100074 [2]北京航空航天大学数学与系统科学学院数学信息与行为教育部重点实验室,北京100191

出　　处：《计算物理》2017年第1期1-9,共9页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11201442)资助项目

摘　　要：研究非接触水下爆炸中板结构厚度和密度对冲击载荷和空化演变的影响.将近期发展的修正的虚拟流体方法推广应用于处理可压缩流体与弹性板结构的非线性相互作用.研究发现,假设结构不发生断裂破坏,较小的板厚度或密度可以减弱爆炸波对结构的冲击,冲击载荷随着厚度或密度的增大非线性地趋向于固壁边界下的结果.而且较小的板厚度或密度可以促使空化较早形成,产生较大的空化区,并推迟和减弱空化破裂对结构的二次冲击.Effects of thickness and density of plate on impact load and cavitation evolution in non-contact underwater explosions are investigated. A modified ghost fluid method developed recently is extended to treat nonlinear interaction between compressible flow and elastic plate. With assumption that fracture of a plate does not occur, it discloses that relatively small thickness or density of plate weakens impact of blast wave on structure. Impact load tends to result of rigid wall boundary nonlinearly with increase of thickness or density. Furthermore, smaller thickness or density causes cavitation to occur earlier and creates a larger cavitation region. It delays and weakens secondary impact on structure induced by cavitation collapse as well.

关 键 词：水下爆炸 流固耦合 修正的虚拟流体方法 冲击载荷 空化破裂 

分 类 号：O351.2[理学—流体力学] O383[理学—力学]