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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; Zhang, QS (reprint author)
发表期刊ASTROPHYSICAL JOURNAL
2016-02-20
卷号818期号:2
DOI10.3847/0004-637X/818/2/146
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收录类别SCI
关键词Convection Stars: Evolution Stars: Interiors
摘要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.
项目资助者National Natural Science Foundation of China(11303087) ; Chinese Academy of Sciences ("Light of West China" Program) ; Chinese Academy of Sciences (Youth Innovation Promotion Association)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2016-02-25
WOS记录号WOS:000372302800045
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMONUCLEAR REACTION-RATES ; STELLAR INTERIORS ; SOLAR MODELS ; ZONE ; STARS ; BASE ; PENETRATION ; EVOLUTION ; ENVELOPE ; SUN
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9360
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Zhang, QS (reprint author)
作者单位1.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
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Zhang QS,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,&Zhang, QS .(2016).A SIMPLE SCHEME TO IMPLEMENT A NONLOCAL TURBULENT CONVECTION MODEL FOR CONVECTIVE OVERSHOOT MIXING.ASTROPHYSICAL JOURNAL,818(2).
MLA Zhang QS,et al."A SIMPLE SCHEME TO IMPLEMENT A NONLOCAL TURBULENT CONVECTION MODEL FOR CONVECTIVE OVERSHOOT MIXING".ASTROPHYSICAL JOURNAL 818.2(2016).
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