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Shock interaction with a heavy gas cylinder: Emergence of vortex bilayers and vortex-accelerated baroclinic circulation generation

机译:与重型气瓶的冲击相互作用:涡旋双层的出现和涡旋加速斜压循环的产生

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We present a numerical study to late times of a Richtmyer-Meshkov environment: a weak shock (M = 1.095) interacting with a heavy cylindrical bubble. The bubble interface is modeled as a diffuse interfacial transition layer (ITL) with finite thickness. Our simulation with the piecewise parabolic method (PPM) yields very good agreement in large- and intermediate-scale features with Jacobs' experiment (Jacobs, 1993). We note the primary circulation enhancement deposited baroclinically upon the incident shock wave, and significant secondary baroclinic circulation enhancement, first observed in Zabusky and Zhang (2002). We propose that this vortex-accelerated circulation deposition is universal. These baroclinic processes are mediated by a strong gradient intensification and stretching of the ITL and result in close-lying vortex bilayers (VBLs) and the emergence of vortex projectiles (VPs). These account for the elongated, kidney-shaped morphology of the rolled up bubble domain at late times. [References: 12]
机译:我们目前对Richtmyer-Meshkov环境的晚期进行了数值研究:弱冲击(M = 1.095)与重圆柱气泡相互作用。气泡界面被建模为具有有限厚度的扩散界面过渡层(ITL)。我们使用分段抛物线法(PPM)进行的仿真在Jacobs的实验中(Jacobs,1993)在大型和中型特征中取得了很好的一致性。我们注意到,主要的循环增强作用是在入射冲击波下斜压沉积的,而显着的次要斜压循环增强是在Zabusky和Zhang(2002)中首次观察到的。我们认为这种涡旋加速的循环沉积是普遍的。这些斜斜过程是由ITL的强烈梯度增强和拉伸介导的,并导致紧密的涡旋双层(VBL)和涡旋弹丸(VP)的出现。这些解释了在晚期卷起的气泡域的细长的肾形形态。 [参考:12]

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