Numerical simulations of downward convective overshooting in giants
文献类型：期刊论文
| 作者 | Tian, Chun-Lin2,3; Deng, Li-Cai2 ; Chan, Kwing-Lam4
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2009-09-11 |
| 卷号 | 398期号:2页码:1011-1022 |
| 关键词 | convection hydrodynamics turbulence methods: numerical stars: interiors |
| 英文摘要 | An attempt at understanding downward overshooting in the convective envelopes of post-main-sequence stars has been made on the basis of three-dimensional large-eddy simulations, using artificially modified OPAL opacity and taking into account radiation and ionization in the equation of state. Two types of star, an intermediate-mass star and a massive star, were considered. To avoid a long thermal relaxation time of the intermediate-mass star, we increased the stellar energy flux artificially while trying to maintain a structure close to the one given by a 1D stellar model. A parametric study of the flux factor was performed. For the massive star, no such process was necessary. Numerical results were analysed when the system reached the statistical steady state. It was shown that the penetration distance in pressure scaleheights is of the order of unity. The scaling relations between penetration distance, input flux and vertical velocity fluctuations studied by Singh et al. were checked. The anisotropy of the turbulent convection and the diffusion models of the third-order moments representing the non-local transport were also investigated. These models are dramatically affected by the velocity fields and no universal constant parameters seem to exist. The limitations of the numerical results were also discussed. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000269507200038 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7556]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observatories, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 4.Hong Kong Univ Sci & Technol, Dept Math, Hong Kong, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tian, Chun-Lin,Deng, Li-Cai,Chan, Kwing-Lam. Numerical simulations of downward convective overshooting in giants[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,398(2):1011-1022. |
| APA | Tian, Chun-Lin,Deng, Li-Cai,&Chan, Kwing-Lam.(2009).Numerical simulations of downward convective overshooting in giants.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,398(2),1011-1022. |
| MLA | Tian, Chun-Lin,et al."Numerical simulations of downward convective overshooting in giants".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 398.2(2009):1011-1022. |
入库方式： OAI收割
来源：国家天文台
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