Mach number dependence of turbulent magnetic field amplification: solenoidal versus compressive flows

We study the growth rate and saturation level of the turbulent dynamo in magnetohydrodynamical simulations of turbulence, driven with solenoidal (divergence-free) or compressive (curl-free) forcing. For models with Mach numbers ranging from 0.02 to 20, we find significantly different magnetic field...

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Published in:Physical review letters 2011-09, Vol.107 (11), p.114504-114504, Article 114504
Main Authors: Federrath, C, Chabrier, G, Schober, J, Banerjee, R, Klessen, R S, Schleicher, D R G
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cited_by cdi_FETCH-LOGICAL-c411t-f3ca349ae1b9445f5ce1879aa5d66b6004ff7bea2632d978901df9c0fbdc69583
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container_end_page 114504
container_issue 11
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creator Federrath, C
Chabrier, G
Schober, J
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Schleicher, D R G
description We study the growth rate and saturation level of the turbulent dynamo in magnetohydrodynamical simulations of turbulence, driven with solenoidal (divergence-free) or compressive (curl-free) forcing. For models with Mach numbers ranging from 0.02 to 20, we find significantly different magnetic field geometries, amplification rates, and saturation levels, decreasing strongly at the transition from subsonic to supersonic flows, due to the development of shocks. Both extreme types of turbulent forcing drive the dynamo, but solenoidal forcing is more efficient, because it produces more vorticity.
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title Mach number dependence of turbulent magnetic field amplification: solenoidal versus compressive flows
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