Mach Number Dependence of Turbulent Magnetic Field Amplification: Solenoidal versus Compressive Flows

Details Mach Number Dependence of Turbulent Magnetic Field Amplification: Solenoidal versus Compressive Flows Mach Number Dependence of Turbulent Magnetic Field Amplification: Solenoidal versus Compressive Flows

2011-09-08

arxiv.org/abs/1109.1760v1

Phys. Rev. Lett. 107, 114504 (2011)

Physics

Fluid Dynamics

4 pages, 3 figures, published in Physical Review Letters (Phys. Rev. Lett. 107, 114504 (2011)), for more information and movie

Scientific paper

10.1103/PhysRevLett.107.114504

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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