摘要
近水面水下爆炸后形成的冲击波很快与空气一水的自由界面相互作用，产生折射激波和反射稀疏波，这些波在形成初期是规则的，但很快转变为不规则波。伴随冲击波与自由界面的相互作用，水面要上升直至被炸开。这些复杂的物理现象对数值计算提出了很高的要求。本文采用近期发展起来的位标函数方法以及高精度的ＮＮＤ格式来数值模拟冲击波、自由界面的运动及其相互作用，获得了成功，近水面水下爆炸时的一系列复杂的物理现象均得到了合理的再现。与现有的跟踪自由界面运动的方法相比较，本文方法更简洁，更实用。
The strong blast-wave generated from an intense underwater explosion interactsstrongly with the air-watcrinterfacet forming refractive shock wave and reflective rarefactionwave.These waves are regular initially,but soon develops into irregular pattern. Accompa-nied with this interaction between the blast wave and the free surface,a spray dome formsand develops into a huge hollow water-column. These complex physical features put greatdemands on numerical computation that the numerics should be able to capture severe free-surface distortion and complex wave pattern. In the present work,we apply the level-setfunction approach to resolve the free-surface motion,the distortion of the surface and theinteractions between air-water interface and blast wave can be successfully captured.Thepresent method is simple and second-order accurate. It provides an effective means forsolving the problems involving free-surface motion.
出处
《力学学报》
EI
CSCD
北大核心
1995年第3期267-276,共10页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家教委留学回国人员基金
关键词
冲击波
自由界面
折射波
稀疏波
水下爆炸
blast wave,free surface,level-set function,refraction wave,rarefaiction wave
