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Title:
Astrophysical turbulence modeling
Authors:
Brandenburg, Axel; Nordlund, Åke
Affiliation:
AA(NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden ; Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden), AB(Niels Bohr Institute, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark)
Publication:
Reports on Progress in Physics, Volume 74, Issue 4, pp. 046901 (2011).
Publication Date:
04/2011
Origin:
IOP
DOI:
10.1088/0034-4885/74/4/046901
Bibliographic Code:
2011RPPh...74d6901B

Abstract

The role of turbulence in various astrophysical settings is reviewed. Among the differences to laboratory and atmospheric turbulence we highlight the ubiquitous presence of magnetic fields that are generally produced and maintained by dynamo action. The extreme temperature and density contrasts and stratifications are emphasized in connection with turbulence in the interstellar medium and in stars with outer convection zones, respectively. In many cases turbulence plays an essential role in facilitating enhanced transport of mass, momentum, energy and magnetic fields in terms of the corresponding coarse-grained mean fields. Those transport properties are usually strongly modified by anisotropies and often completely new effects emerge in such a description that have no correspondence in terms of the original (non-coarse-grained) fields.
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