Stabilization of ablative Rayleigh-Taylor instability due to change of the Atwood number.
Stabilization of ablative Rayleigh-Taylor instability due to change of the Atwood number.
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DOI：
10.1103/physreve.65.057401
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发表时间：
2002-05
期刊：
影响因子：
--
通讯作者：
W. Ye;Weiyan Zhang;X. He
中科院分区：
文献类型：
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作者：
W. Ye;Weiyan Zhang;X. He
最近的实验[S.G. Glendinning等人，物理修订信函78，3318（1997）]表明，在预热条件下，激光烧蚀瑞利-泰勒（RT）不稳定性增长率的测量值约为经典值的50%，与用计算机程序LASNEX得到的模拟值相比降低了约18%。通过改变低温下电子热导率随温度的变化，模拟得到了Bhatnagar-Gross-Krook近似下的密度分布，模拟的RT增长率与Glendinning等人的实验值吻合较好。在预热的情况下，阿特伍德数的变化也导致RT稳定。RT生长公式γ =[Akg/（1+AkL）] - 2kV（α）的平方根与实验和模拟结果吻合良好，适用于预热情况。
Recent experiment [S.G. Glendinning et al., Phys. Rev. Lett. 78, 3318 (1997)] showed that the measured growth rate of laser ablative Rayleigh-Taylor (RT) instability with preheating is about 50% of the classic value and is reduced by about 18% compared with the simulated value obtained with the computer code LASNEX. By changing the temperature variation of the electron thermal conductivity at low temperatures, the density profile from the Bhatnagar-Gross-Krook approximation is recovered in the simulation, and the simulated RT growth rate is in good agreement with the experimental value from Glendinning et al. The preheated density profile on ablative RT stablization is studied numerically. A change of the Atwood number in the preheating case also leads to RT stabilization. The RT growth formula gamma=square root of [Akg/(1+AkL)] - 2kV(a) agrees well with experiment and simulation, and is appropriate for the preheating case.