Preheating ablation effects on the Rayleigh-Taylor instability in the weakly nonlinear regime
文献类型：期刊论文
| 作者 | Wang, LF ; Ye, WH ; Sheng, ZM ; Don, WS ; Li, YJ ; He, XT |
| 刊名 | PHYSICS OF PLASMAS
 |
| 出版日期 | 2010 |
| 卷号 | 17期号:12 |
| 关键词 | INERTIAL CONFINEMENT FUSION GROWTH-RATES PLANAR TARGETS DENSITY SCHEMES STABILIZATION STABILITY FRONTS LIGHT MODEL |
| ISSN号 | 1070-664X |
| 通讯作者 | Ye, WH (reprint author), Peking Univ, CAPT, Beijing 100871, Peoples R China. |
| 中文摘要 | The two-dimensional Rayleigh-Taylor instability (RTI) with and without thermal conduction is investigated by numerical simulation in the weakly nonlinear regime. A preheat model kappa(T) = kappa(SH)[1 + f(T)] is introduced for the thermal conduction [W. H. Ye, W. Y. Zhang, and X. T. He, Phys. Rev. E 65, 057401 (2002)], where kappa(SH) is the Spitzer-Harm electron thermal conductivity coefficient and f(T) models the preheating tongue effect in the cold plasma ahead of the ablation front. The preheating ablation effects on the RTI are studied by comparing the RTI with and without thermal conduction with identical density profile relevant to inertial confinement fusion experiments. It is found that the ablation effects strongly influence the mode coupling process, especially with short perturbation wavelength. Overall, the ablation effects stabilize the RTI. First, the linear growth rate is reduced, especially for short perturbation wavelengths and a cutoff wavelength is observed in simulations. Second, the second harmonic generation is reduced for short perturbation wavelengths. Third, the third-order negative feedback to the fundamental mode is strengthened, which plays a stabilization role. Finally, on the contrary, the ablation effects increase the generation of the third harmonic when the perturbation wavelengths are long. Our simulation results indicate that, in the weakly nonlinear regime, the ablation effects are weakened as the perturbation wavelength is increased. Numerical results obtained are in general agreement with the recent weakly nonlinear theories as proposed in [J. Sanz, J. Ramirez, R. Ramis et al., Phys. Rev. Lett. 89, 195002 (2002); J. Garnier, P.-A. Raviart, C. Cherfils-Clerouin et al., Phys. Rev. Lett. 90, 185003 (2003)]. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3517606] |
| 收录类别 | SCI |
| 资助信息 | National Basic Research Program of China [2007CB815100]; National Natural Science Foundation of China [10935003, 11075024, 10905006, 11074300]; Hong Kong Research Grants Council |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51237]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang, LF,Ye, WH,Sheng, ZM,et al. Preheating ablation effects on the Rayleigh-Taylor instability in the weakly nonlinear regime[J]. PHYSICS OF PLASMAS,2010,17(12). |
| APA | Wang, LF,Ye, WH,Sheng, ZM,Don, WS,Li, YJ,&He, XT.(2010).Preheating ablation effects on the Rayleigh-Taylor instability in the weakly nonlinear regime.PHYSICS OF PLASMAS,17(12). |
| MLA | Wang, LF,et al."Preheating ablation effects on the Rayleigh-Taylor instability in the weakly nonlinear regime".PHYSICS OF PLASMAS 17.12(2010). |
入库方式： OAI收割
来源：物理研究所
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