近自由液面气泡与冲击波的相互作用

Interaction between bubble near free surface and shock wave

[目的]为了研究自由液面、气泡与冲击波三者之间的相互作用,[方法]基于间断迦辽金法,结合Level Set与Real Ghost Fluid方法,分析复杂流场中冲击波传播特性及气泡运动特性,描述流场内各种波系的生成与发展过程。[结果]结果表明:在相互作用过程中,流场生成的复杂波系中包含多个稀疏波和冲击波。自由液面减缓了气泡的溃灭速度,而入射冲击波则加快了气泡的溃灭速度,并使自由液面的上拱运动增大。[结论]所得结果可为水下爆炸对舰船结构的毁伤机理提供参考。

[Objectives]This paper presents research into the interaction between a free surface,shockwave and bubble.[Methods]Based on the Discontinuous Galerkin method and combined with the LevelSet method and Real Ghost Fluid method,the characteristics of shock wave propagation and bubble motionare analyzed,the generation and evolution of waves in fluid fields are described in detail.[Results]Theresults show the presence of complex waves in the fluid field after the interaction,including multiplerarefaction waves and shock waves. The collapse speed of the bubble is slowed down with the existence ofthe free surface,while the shock wave of the incident accelerates the collapse speed of the bubble andincreases the up warp motion of the free surface.[Conclusions]The conclusions drawn from this papercan be used as reference points for further research into the damage mechanisms of ship structuressubjected to underwater explosions.