Formation of large-scale structures in ablative Kelvin-Helmholtz instability

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	Formation of large-scale structures in ablative Kelvin-Helmholtz instability
	Wang, LF ; Ye, WH ; Don, WS ; Sheng, ZM ; Li, YJ ; He, XT
刊名	PHYSICS OF PLASMAS
	2010
卷号	17 期号:12
关键词	LASER-PRODUCED PLASMAS ASTROPHYSICAL JETS LABORATORY ASTROPHYSICS MAGNETOTAIL BOUNDARY GEOTAIL OBSERVATIONS INTENSE LASERS MIXING LAYER SOLAR-WIND SCHEMES TRANSPORT
ISSN号	1070-664X
通讯作者	Ye, WH: Peking Univ, CAPT, Beijing 100871, Peoples R China.
中文摘要	In this research, we studied numerically nonlinear evolutions of the Kelvin-Helmholtz instability (KHI) with and without thermal conduction, aka, the ablative KHI (AKHI) and the classical KHI (CKHI). The second order thermal conduction term with a variable thermal conductivity coefficient is added to the energy equation in the Euler equations in the AKHI to investigate the effect of thermal conduction on the evolution of large and small scale structures within the shear layer which separate the fluids with different velocities. The inviscid hyperbolic flux of Euler equation is computed via the classical fifth order weighted essentially nonoscillatory finite difference scheme and the temperature is solved by an implicit fourth order finite difference scheme with variable coefficients in the second order parabolic term to avoid severe time step restriction imposed by the stability of the numerical scheme. As opposed to the CKHI, fine scale structures such as the vortical structures are suppressed from forming in the AKHI due to the dissipative nature of the second order thermal conduction term. With a single-mode sinusoidal interface perturbation, the results of simulations show that the growth of higher harmonics is effectively suppressed and the flow is stabilized by the thermal conduction. With a two-mode sinusoidal interface perturbation, the vortex pairing is strengthened by the thermal conduction which would allow the formation of large-scale structures and enhance the mixing of materials. In summary, our numerical studies show that thermal conduction can have strong influence on the nonlinear evolutions of the KHI. Thus, it should be included in applications where thermal conduction plays an important role, such as the formation of large-scale structures in the high energy density physics and astrophysics. (C) 2010 American Institute of Physics. [doi:10.1063/1.3524550]
收录类别	SCI
资助信息	Hong Kong Research Grants Council; National Basic Research Program of China [2007CB815100]; National Natural Science Foundation of China [11075024, 10935003, 10905006, 11074300]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/38406]
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,Don, WS,et al. Formation of large-scale structures in ablative Kelvin-Helmholtz instability[J]. PHYSICS OF PLASMAS,2010,17(12).
APA	Wang, LF,Ye, WH,Don, WS,Sheng, ZM,Li, YJ,&He, XT.(2010).Formation of large-scale structures in ablative Kelvin-Helmholtz instability.PHYSICS OF PLASMAS,17(12).
MLA	Wang, LF,et al."Formation of large-scale structures in ablative Kelvin-Helmholtz instability".PHYSICS OF PLASMAS 17.12(2010).