Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-14T05:21:00.408Z Has data issue: false hasContentIssue false
  • English
  • Français

Coherent structures in granulation convection and their importance for higher order closure models

Published online by Cambridge University Press:  01 August 2006

F. Kupka  and
F. J. Robinson
F. Kupka
Affiliation:
Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str. 1, 85741 Garching, Germany email: [email protected]
F. J. Robinson
Affiliation:
Dept. of Geology and Geophysics, Yale Univ., Box 208109, New Haven, CT 06520-8109, USA email: [email protected], [email protected] Astronomy Department, Yale University, Box 208101, New Haven, CT 06520-8101, USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We use numerical simulations of granulation in the Sun and a K dwarf to study the effects of coherent structures on higher order moments. The latter need to be calculated in non-local Reynolds stress models of turbulent convection. Models that explicitly account for the asymmetry between up- and downflows as well as hot and cold drafts provide a substantial improvement over traditional ones, such as the quasi-normal approximation, which is only able to provide order of magnitude estimates for this type of flow.

Keywords

ConvectionturbulenceSun: atmosphereinteriorsstars: atmospheresinteriors
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 74 - 76
Copyright
Copyright © International Astronomical Union 2007

References

Alexander, D. R. & Ferguson, J. W. 1994, ApJ 437, 879 (AF94)CrossRefGoogle Scholar
Belkacem, K., Samadi, R., Goupil, M. J., Kupka, F. & Baudin, F., 2007, this volume p. 376CrossRefGoogle Scholar
Canuto, V. M. 1992, ApJ 392, 218CrossRefGoogle Scholar
Canuto, V. M. 1993, ApJ 416, 331CrossRefGoogle Scholar
Canuto, V. M. 1997, ApJ 482, 827CrossRefGoogle Scholar
Grossman, S. A. & Narayan, R. 1993, ApJS 89, 361CrossRefGoogle Scholar
Gryanik, V. M. & Hartmann, J. 2002, J. Atmos. Sci. 59, 27292.0.CO;2>CrossRefGoogle Scholar
Gryanik, V. M., Hartmann, J., Raasch, S. & Schröter, M. 2005, J. Atmos. Sci. 62, 2632CrossRefGoogle Scholar
Iglesias, C. A. & Rogers, F. J. 1996, ApJ 464, 943 (OPAL96)CrossRefGoogle Scholar
Kupka, F. & Robinson, F. J. 2007, MNRAS 374, 305CrossRefGoogle Scholar
Kupka, F. & Muthsam, H. J. 2007, this volume p. 76Google Scholar
Robinson, F. J., Demarque, P., Li, L. H., Sofia, S., Kim, Y.-C., Chan, K. L. & Guenther, D. B. 2003, MNRAS 340, 923CrossRefGoogle Scholar
Stein, R. F. & Nordlund, Å. 1998, ApJ 499, 914CrossRefGoogle Scholar
Xiong, D. R., Cheng, Q. L. & Deng, L. 1997, ApJS 108, 529CrossRefGoogle Scholar