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A SIMPLE SCHEME TO IMPLEMENT A NONLOCAL TURBULENT CONVECTION MODEL FOR CONVECTIVE OVERSHOOT MIXING
Zhang QS(张钱生)1,2
Source PublicationASTROPHYSICAL JOURNAL
2016-02-20
Volume818Issue:2
DOI10.3847/0004-637X/818/2/146
Contribution Rank第1完成单位
Indexed BySCI
KeywordConvection Stars: Evolution Stars: Interiors
Abstract

Classical "ballistic" overshoot models show some contradictions and are not consistent with numerical simulations and asteroseismic studies. Asteroseismic studies imply that overshoot is a weak mixing process. A diffusion model is suitable to deal with it. The form of diffusion coefficient in a diffusion model is crucial. Because overshoot mixing is related to convective heat transport (i.e., entropy mixing), there should be some similarity between them. A recent overshoot mixing model shows consistency between composition mixing and entropy mixing in the overshoot region. A prerequisite to apply the model is to know the dissipation rate of turbulent kinetic energy. The dissipation rate can be worked out by solving turbulent convection models (TCMs). But it is difficult to apply TCMs because of some numerical problems and the enormous time cost. In order to find a convenient way, we have used the asymptotic solution and simplified the TCM to a single linear equation for turbulent kinetic energy. This linear model is easy to implement in calculations of stellar evolution with negligible extra time cost. We have tested the linear model in stellar evolution, and have found that it can well reproduce the turbulent kinetic energy profile of the full TCM, as well as the diffusion coefficient, abundance profile, and stellar evolutionary tracks. We have also studied the effects of different values of the model parameters and have found that the effect due to the modification of temperature gradient in the overshoot region is slight.

Funding ProjectNational Natural Science Foundation of China[11303087] ; Chinese Academy of Sciences ("Light of West China" Program) ; Chinese Academy of Sciences (Youth Innovation Promotion Association)
Funding OrganizationNational Natural Science Foundation of China[11303087] ; Chinese Academy of Sciences ("Light of West China" Program) ; Chinese Academy of Sciences (Youth Innovation Promotion Association)
Language英语
Subject Area天文学 ; 天体物理学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
Archive Date2016-02-25
WOS IDWOS:000372302800045
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMONUCLEAR REACTION-RATES ; STELLAR INTERIORS ; SOLAR MODELS ; ZONE ; STARS ; BASE ; PENETRATION ; EVOLUTION ; ENVELOPE ; SUN
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9360
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorZhang QS(张钱生)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang QS. A SIMPLE SCHEME TO IMPLEMENT A NONLOCAL TURBULENT CONVECTION MODEL FOR CONVECTIVE OVERSHOOT MIXING[J]. ASTROPHYSICAL JOURNAL,2016,818(2).
APA Zhang QS.(2016).A SIMPLE SCHEME TO IMPLEMENT A NONLOCAL TURBULENT CONVECTION MODEL FOR CONVECTIVE OVERSHOOT MIXING.ASTROPHYSICAL JOURNAL,818(2).
MLA Zhang QS."A SIMPLE SCHEME TO IMPLEMENT A NONLOCAL TURBULENT CONVECTION MODEL FOR CONVECTIVE OVERSHOOT MIXING".ASTROPHYSICAL JOURNAL 818.2(2016).
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