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An anisotropic nonlocal convection theory
Deng, L; Xiong, DR; Chan, KL
2006-05-20
发表期刊ASTROPHYSICAL JOURNAL
ISSN0004-637X
卷号643期号:1页码:426-437
摘要We present in this paper an anisotropic nonlocal theory of stellar convection. Following the idea of Rotta, we propose that the correlation of turbulent pressure and velocity gradient tends to make the turbulent velocity isotropic, and we further introduce a convection parameter c(3) to measure the strength of such isotropization. By using such a theory, the structure of the solar convection zone is calculated. Our calculation shows that the radial component dominates in the convectively unstable zone, in which the ratio between the radial component and the horizontal component is w(r)(2)/w(h)(2) = ( 3 + c(3))/2c(3). In the upper overshooting zone, turbulent velocity is almost isotropic ( w(r)(2)/w(h)(2) similar to 0.5) and is independent of c(3), while in the lower overshooting zone, w(r)(2)/w(h)(2) similar to 0.5, and it tends to decrease as c(3) decreases. We also studied the effects of anisotropic convection on the structure and evolution of stars. It is shown that the anisotropy hardly affects the temperature and pressure structure of stars. However, the anisotropy increases with the decrease of c(3); therefore, the effect of overshooting decreases. Thus, the effects of anisotropy of turbulent convection on stellar evolution cannot be neglected.
文章类型Article
关键词Convection Stars : Evolution
WOS标题词Science & Technology ; Physical Sciences
学科领域Astronomy & Astrophysics
关键词[WOS]TURBULENT CONVECTION ; OVERSHOOTING ZONE ; SOLAR PHOTOSPHERE ; HEIGHT DEPENDENCE ; MASSIVE STARS ; MIXING-LENGTH ; ATMOSPHERE ; VELOCITY ; OSCILLATIONS ; SIMULATIONS
收录类别SCI
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000237624900040
引用统计
被引频次:33[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/11203
专题院士文集_熊大闰
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Math, Kowloon, Hong Kong, Peoples R China
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Deng, L,Xiong, DR,Chan, KL. An anisotropic nonlocal convection theory[J]. ASTROPHYSICAL JOURNAL,2006,643(1):426-437.
APA Deng, L,Xiong, DR,&Chan, KL.(2006).An anisotropic nonlocal convection theory.ASTROPHYSICAL JOURNAL,643(1),426-437.
MLA Deng, L,et al."An anisotropic nonlocal convection theory".ASTROPHYSICAL JOURNAL 643.1(2006):426-437.
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