Preheating ablation effects on the Rayleigh-Taylor instability in the weakly nonlinear regime

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	Preheating ablation effects on the Rayleigh-Taylor instability in the weakly nonlinear regime
	Wang, LF ; Ye, WH ; Sheng, ZM ; Don, WS ; Li, YJ ; He, XT
刊名	PHYSICS OF PLASMAS
	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
内容类型	期刊论文
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).