A new two-columns description for convective transport in stars
Assuming that the largest convective patterns generate the majority of convective transport,we devise a numerical scheme simplifying the convective velocity field using two parallel radial columns to represent up-and downstream flows. Horizontal exchange is described by fluid flow and radiation over the interface between those two columns. The main parameters of this convective description have a straightforward geometrical meaning,namely the diameter of the columns (representing the size of the convective cells) and the ratio of cross section between up-and downdrafts. For this geometrical setup,the equations of radiation hydrodynamics are solved time-dependently using an implicit scheme which has the advantage of being devoid of any time step limits. In order to demonstrate our approach,we present comparisons with detailed 2D hydrodynamics computations for the example of convection zones in Cepheids.
hydrodynamics Cepheids convection methods:numerical
Alexander St(o)kl
CRAL,Université de Lyon,CNRS (UMR5574),Ecole Normale Supérieure de Lyon,F-69007 Lyon,France
国际会议
The 252th Symposium of the International Astronomical Union(国际天文学联合会第252届研讨会)
海南三亚
英文
89-96
2008-04-06（万方平台首次上网日期，不代表论文的发表时间）