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Interaction of cylindrical converging shocks with an equilateral triangular SF6 cylinder

机译：圆柱会聚冲击与等边三角形SF6气缸的相互作用

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摘要

Based on the compressible large eddy simulation method, combined with the hybrid scheme of the weighted essentially nonoscillatory scheme and the tuned central difference scheme, the interaction of the cylindrical converging shock wave with an equilateral triangle SF6 cylinder is numerically simulated in this work. The numerical results clearly show the evolution of the interface induced by the Richtmyer-Meshkov instability due to the interaction of the converging shock and the interface, which are in good agreement with previous experimental results. However, the numerical results reveal clearly the evolution and characteristics of the shock wave structures, and find that there are five times of shock focusing during the interaction process of shock waves with the interfaces. The characteristics of the mean flow, the width and growth rate of the mixing-layer, the circulation evolution, and history of the mixing ratio have also been quantitatively analyzed and it was found that the secondary reflected shock can lead to rapid mixing. Meanwhile, a dynamic mode decomposition method is applied to extract the coherent structures for discovering the mechanism of turbulent mixing. Published under license by AIP Publishing. Published under license by AIP Publishing.
机译：基于可压缩大型涡流模拟方法，与基本上非振动方案的混合方案和调谐中心差方案结合，在该工作中对圆柱会聚冲击波与等边三角形SF6圆柱的相互作用。数值结果清楚地显示了Richtmyer-Meshkov稳定性引起的界面的演变，由于会聚冲击和界面的相互作用，与先前的实验结果吻合良好。然而，数值结果显然揭示了冲击波结构的进化和特征，并发现在与接口的冲击波相互作用过程中存在五次冲击聚焦。也定量地分析了混合层的平均流量，循环进化和历史的平均流量，循环进化和历史的特性，发现二次反射冲击可以快速混合。同时，施加动态模式分解方法以提取用于发现湍流混合机理的相干结构。通过AIP发布在许可证下发布。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第8期|共15页
  • 作者

    Zheng Chun; Zhang Huanhao; Chen Zhihua; Wu Wei-Tao; Sha Sha;

  • 作者单位

    Nanjing Univ Sci &

    Technol Key Lab Transient Phys Nanjing 210094 Jiangsu Peoples R China;

    Nanjing Univ Sci &

    Technol Key Lab Transient Phys Nanjing 210094 Jiangsu Peoples R China;

    Nanjing Univ Sci &

    Technol Key Lab Transient Phys Nanjing 210094 Jiangsu Peoples R China;

    Nanjing Univ Sci &

    Technol Sch Mech Engn Nanjing 210094 Jiangsu Peoples R China;

    Beijing Inst Elect Engn Beijing 100854 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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