Numerical investigation of shock-SF6 bubble interaction with different mach numbers
Numerical investigation of shock-SF6 bubble interaction with different mach numbers
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DOI：
10.1016/j.compfluid.2018.10.009
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发表时间：
2018-11
影响因子：
2.8
通讯作者：
Yuejin Zhu;Yang Zhiwei;Z. Pan;Penggang Zhang;J. Pan
中科院分区：
文献类型：
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作者：
Yuejin Zhu;Yang Zhiwei;Z. Pan;Penggang Zhang;J. Pan
给出了激波与SF6重泡相互作用的计算结果。利用高分辨率计算格式，阐明了不同入射激波马赫数(Ma= 1.2 1、1.7和2.1)对相互作用过程的影响。结果表明，SF6气泡的变形随入射激波强度的增大而不同，不同的激波马赫数会改变激波聚焦位置到下游气泡界面的距离。最小距离出现在Ma= 1.7时，因此这种情况下的射流结构是三种情况中最长的。此外，随着入射激波马赫数的增加，气泡体积(V)和有效气泡体积(V有效)减小，但压缩比、两种流体的混合度和涡量都增大。此外，还分析了影响涡度演变的因素，发现压缩项对涡度演变的影响相对较大，斜压项和粘性项对涡度演变的影响较小。
The computational results of the shock-SF6heavy bubble interaction are presented. Influences of different incident shock Mach numbers (Ma= 1.21, 1.7 and 2.1) on the interaction processes are clarified by using the high resolution computation schemes. It is concluded that the SF6bubble deforms differently with the raised incident shock intensity, and the different shock Mach numbers could alter the distance between the shock focusing position and the downstream bubble interface. The minimum distance emerges whenMa= 1.7, so the jet structure in this case is the longest among the three cases. Besides, with the increasement of incident shock Mach numbers, the bubble volume (V) and effective bubble volume (Veffective) decrease, but the compression ratio, the mixedness between two different fluids and the vorticity are all raised. Furthermore, the factors affecting the vorticity evolution are also analyzed, and it is found that the compression term has a relatively stronger influence on the vorticity evolution than the baroclinic term and viscosity term.