Locality properties of the energy flux in magnetohydrodynamic turbulence

The scale locality functions, originally introduced by Kraichnan for hydrodynamic turbulence, are computed from results of direct numerical simulations of forced magnetohydrodynamic turbulence. It is found that asymptotically the dynamics is dominated by local interactions, but the locality is much...

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Bibliographic Details
Published in:Physics of fluids (1994) 2010-05, Vol.22 (5), p.051702-051702-4
Main Authors: Domaradzki, J. Andrzej, Teaca, Bogdan, Carati, Daniele
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma turbulence
Waves, oscillations, and instabilities in plasmas and intense beams
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Summary:The scale locality functions, originally introduced by Kraichnan for hydrodynamic turbulence, are computed from results of direct numerical simulations of forced magnetohydrodynamic turbulence. It is found that asymptotically the dynamics is dominated by local interactions, but the locality is much weaker than in hydrodynamic turbulence, which is characterized by the scaling exponent of 4/3. Specifically, in magnetohydrodynamic turbulence, two distinct exponents are observed, 1/3 and 2/3. Despite that, direct numerical simulation results reported in this paper exhibit strong coupling between large scales from the forcing band and smallest resolved scales because the locality is too weak to achieve decoupling for the numerical resolution available.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.3431227