Non-linear characteristics of Rayleigh-Taylor instable perturbations

The direct numerical simulation method is adopted to study the non-linear characteristics of Rayleigh-Taylor instable perturbations at the ablation front of a 200 μm planar CH ablation target. In the simulation, the classical electrical thermal conductivity is included, and NND difference scheme is...

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Bibliographic Details
Published in:Acta mechanica Sinica 2008-04, Vol.24 (2), p.143-149
Main Authors: Fan, Zhengfeng, Luo, Jisheng
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Computational Intelligence
Engineering
Engineering Fluid Dynamics
Research Paper
Theoretical and Applied Mechanics
径直数字模拟
限制性变化
非线性特征
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Summary:The direct numerical simulation method is adopted to study the non-linear characteristics of Rayleigh-Taylor instable perturbations at the ablation front of a 200 μm planar CH ablation target. In the simulation, the classical electrical thermal conductivity is included, and NND difference scheme is used. The linear growth rates obtained from the simulation agree with the Takabe formula. The ampli- tude distribution of the density perturbation at the ablation front is obtained for the linear growth case. The non-linear characteristics of Rayleigh-Taylor instable perturbations are analyzed and the numerical results show that the amplitude distributions of the compulsive harmonics are very different from that of the fundamental perturbation. The characteristics of the amplitude distributions of the harmonics and their fast growth explain why spikes occur at the ablation front. The numerical results also show that non-linear effects have relations with the phase differences of double mode initial perturbations, and different phase differences lead to varied spikes.
ISSN:0567-7718
1614-3116
DOI:10.1007/s10409-007-0135-9