| タイトル | A theory of nonlocal mixing-length convection. I - The moment formalism |
| 著者（英） | Arnett, David; Grossman, Scott A.; Narayan, Ramesh |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1993-04-10 |
| 言語 | eng |
| 内容記述 | A flexible and potentially powerful theory of convection, based on the mixing length picture, is developed to make unbiased self-consistent predictions about overshooting and other complicated phenomena in convection. The basic formalism is set up, and the method's power is demonstrated by showing that a simplified version of the theory reproduces all the standard results of local convection. The second-order equations of the theory are considered in the limit of a steady state and vanishing third moments, and it is shown that they reproduce all the standard results of local mixing-length convection. There is a particular value of the superadiabatic gradient, below which the only possible steady state of a fluid is nonconvecting. Above this critical value, a fluid is convectively unstable. Two distinct regimes of convection, which are identified as efficient and inefficient convection, are determined. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A34723 |
| 権利 | Copyright |
|
