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Efficient turbulent compressible convection in the deep stellar atmosphere
Tian, Chun-Lin1,2; Deng, Li-Cai1; Chan, Kwing-Lam3; Xiong, Da-Run4
2009
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume9Issue:1Pages:102-114
AbstractWe 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.
KeywordConvection Hydrodynamic Turbulence Method: Numerical Stars: Atmosphere
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordNAVIER-STOKES EQUATIONS ; HYDRODYNAMIC CONVECTION ; EVOLUTION ; SIMULATIONS ; DIFFUSION ; SCHEME ; STARS ; SUN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000264770600009
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/11213
Collection院士文集_熊大闰
Affiliation1.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
GB/T 7714
Tian, Chun-Lin,Deng, Li-Cai,Chan, Kwing-Lam,et al. Efficient turbulent compressible convection in the deep stellar atmosphere[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(1):102-114.
APA Tian, Chun-Lin,Deng, Li-Cai,Chan, Kwing-Lam,&Xiong, Da-Run.(2009).Efficient turbulent compressible convection in the deep stellar atmosphere.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(1),102-114.
MLA Tian, Chun-Lin,et al."Efficient turbulent compressible convection in the deep stellar atmosphere".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.1(2009):102-114.
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