Astrophysical turbulence modeling

Axel Brandenburg; Åke Nordlund

doi:10.1088/0034-4885/74/4/046901

Astrophysical turbulence modeling

37 Citationer (Scopus)

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.

Originalsprog	Engelsk
Tidsskrift	Reports on Progress in Physics
Vol/bind	74
Udgave nummer	4
Sider (fra-til)	046901
ISSN	0034-4885
DOI	https://doi.org/10.1088/0034-4885/74/4/046901
Status	Udgivet - 1 apr. 2011

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10.1088/0034-4885/74/4/046901

Citationsformater

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AU - Nordlund, Åke

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N2 - 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.

AB - 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.

U2 - 10.1088/0034-4885/74/4/046901

DO - 10.1088/0034-4885/74/4/046901

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SP - 046901

JO - Reports on Progress in Physics

JF - Reports on Progress in Physics

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ER -

Astrophysical turbulence modeling

Abstract

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