激光烧蚀RT不稳定性线性增长率和非线性行为的数值研究
NUMERICAL STUDIES OF LINEAR GROWTH RATES AND NONLINEAR EVOLUTION OF LASER ABLATIVE RAYLEIGH TAYLOR INSTABILITY
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摘要: 给出了不同情况下多种波长的烧蚀瑞利泰勒不稳定性线性增长率的二维计算结果，并与Takabe公式和Sanz公式进行了比较，最后给出了单模激光烧蚀RTI非线性发展行为的数值结果。线性增长率的二维计算结果很好验证了Sanz公式，表明β值应是2，不是3。当烧蚀速度较大或烧蚀面较宽时，用Takabe公式估计的烧蚀RTI线性增长率与二维计算值明显不符。
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关键词:
- 瑞利-泰勒不稳定性 /
- 烧蚀致稳 /
- 流体不稳定性数值模拟
Abstract: Linear RTI growth rates simulated by EUL2D at various cases with different perturbation wavelengths are given, and are compared with Takabe formula and Sanz formula. Numerical results of single mode nonlinear RTI evolution with and without electron conduction are compared. 2D simulated results of linear RTI growth rates are quite good agreement with the Sanz formula. The Takabe formula is not agreements with 2D simulations at larger ablative velocity or wider ablative surface. -
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