Large-eddy simulation and multiscale modelling of a Richtmyer–Meshkov instability with reshock
Large-eddy simulation and multiscale modelling of a Richtmyer–Meshkov instability with reshock
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DOI：
10.1017/s0022112006009475
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发表时间：
2006-06
影响因子：
3.7
通讯作者：
D. J. Hill;C. Pantano;D. Pullin
中科院分区：
文献类型：
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作者：
D. J. Hill;C. Pantano;D. Pullin
本文用大涡方法模拟了有再震的Richtmyer-Meshkov不稳定性，并与实验结果进行了比较。几种配置的冲击最初从轻（空气）重（六氟化硫，SF6）进行了模拟，以匹配以前的实验和良好的协议被发现在湍流混合区（TMZ）的增长率。在这项研究中使用的拉伸涡亚网格模型允许亚网格连续建模，其中未解决的流量尺度的统计估计。特别是，这种多尺度建模允许的各向异性的流被扩展到耗散尺度，$\eta$，并估计形成的亚网格概率密度函数的混合分数的空气/SF6的亚网格方差的基础上，包括施密特数的影响。
Large-eddy simulations of the Richtmyer–Meshkov instability with reshock are pre- sented and the results are compared with experiments. Several configurations of shocks initially travelling from light (air) to heavy (sulfur hexafluoride, SF6) have been simulated to match previous experiments and good agreement is found in the growth rates of the turbulent mixing zone (TMZ). The stretched-vortex subgrid model used in this study allows for subgrid continuation modelling, where statistics of the unresolved scales of the flow are estimated. In particular, this multiscale modelling allows the anisotropy of the flow to be extended to the dissipation scale, $\eta$, and estimates to be formed for the subgrid probability density function of the mixture fraction of air/SF6 based on the subgrid variance, including the effect of Schmidt number.