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题名: Efficient turbulent compressible convection in the deep stellar atmosphere
作者: Tian, Chun-Lin1, 2; Deng, Li-Cai1; Chan, Kwing-Lam3; Xiong DaRun(熊大闰)4
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2009
卷号: 9, 期号:1, 页码:102-114
关键词: convection ; hydrodynamic ; turbulence ; method: numerical ; stars: atmosphere
学科分类: Astronomy & Astrophysics
文章类型: Article
英文摘要: We report on an application of gas-kinetic BGK scheme to the computation of turbulent compressible convection in the stellar interior. After incorporating the Sub-grid Scale (SGS) turbulence model into the BGK scheme, we tested the effects of numerical parameters on the quantitative relationships among the thermodynamic variables, their fluctuations and correlations in a very deep, initially gravity-stratified stellar atmosphere. Comparison indicates that the thermal properties and dynamic properties are dominated by different aspects of numerical models separately. An adjustable Deardorff constant in the SGS model c(mu) = 0.25 and an amplitude of artificial viscosity in the gas-kinetic BGK scheme C(2) = 0 are appropriate for the current study. We also calculated the density-weighted auto- and cross-correlation functions in Xiong's turbulent stellar convection theory based on which the gradient type of models of the non-local transport and the anisotropy of the turbulence were preliminarily studied. No universal relations or constant parameters were found for these models.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: NAVIER-STOKES EQUATIONS ; HYDRODYNAMIC CONVECTION ; EVOLUTION ; SIMULATIONS ; DIFFUSION ; SCHEME ; STARS ; SUN
收录类别: SCI
语种: 英语
WOS记录号: WOS:000264770600009
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/11213
Appears in Collections:熊大闰_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Math, Hong Kong, Hong Kong, Peoples R China
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China

Recommended Citation:
Chun-Lin Tian; Li-Cai Deng; Kwing-Lam Chan.Efficient turbulent compressible convection in the deep stellar atmosphere ,Research in Astronomy and Astrophysics  ,2009,9(1):102-114
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