Mach number dependence of the onset of dynamo action

Abstract

The effect of compressibility on the onset of nonhelical turbulent dynamo action is investigated using both direct simulations as well as simulations with shock-capturing viscosities, keeping however the regular magnetic diffusivity. It is found that the critical magnetic Reynolds number increases from about 35 in the subsonic regime to about 70 in the supersonic regime. In the high resolution direct simulations the shock structures are much sharper than in the low resolution shock-capturing simulations. Nevertheless, the magnetic field looks roughly similar in both cases and does not show shock structures. Similarly, the onset of dynamo action is not significantly affected by the shock-capturing viscosity.

arXiv comment6 pages

References in corpus (6)

• The Stellar IMF from Turbulent Fragmentation
• A Super-Alfvenic Model of Dark Clouds
• Mixing Time Scales in a Supernova-Driven Interstellar Medium
• Magnetic Field Evolution in Merging Clusters of Galaxies
• Is nonhelical hydromagnetic turbulence peaked at small scales?
• Structure Function Scaling in Compressible Super-Alfvenic MHD Turbulence

Cited by in corpus (73)

• Astrophysical magnetic fields and nonlinear dynamo theory
• Mach Number Dependence of Turbulent Magnetic Field Amplification: Solenoidal versus Compressive Flows
• Small-scale dynamo action during the formation of the first stars and galaxies. I. The ideal MHD limit
• A robust numerical scheme for highly compressible magnetohydrodynamics: Nonlinear stability, implementation and tests
• A Simple Law of Star Formation
• Current status of turbulent dynamo theory: From large-scale to small-scale dynamos
• Standing on the shoulders of giants: Trojan Earths and vortex trapping in low mass self-gravitating protoplanetary disks of gas and solids
• Magnetic field amplification in turbulent astrophysical plasmas
• The sonic scale revealed by the world's largest supersonic turbulence simulation
• Magnetic fields in the Large-Scale Structure of the Universe
• Magnetic Field Amplification in Galaxy Clusters and its Simulation
• Comparing Numerical Methods for Isothermal Magnetized Supersonic Turbulence
• The onset of a small-scale turbulent dynamo at low magnetic Prandtl numbers
• Impact of tangled magnetic fields on AGN-blown bubbles
• A new interpretation of the far-infrared - radio correlation and the expected breakdown at high redshift
• The Turbulent Dynamo in Highly Compressible Supersonic Plasmas
• Diffusion and Concentration of Solids in the Dead Zone of a Protoplanetary Disk
• Turbulent Torques on Protoplanets in a Dead Zone
• Thermal-Instability-Driven Turbulent Mixing in Galactic Disks: I. Effective Mixing of Metals
• Astrophysical turbulence modeling
• Fluctuation dynamos and their Faraday rotation signatures
• Global magnetohydrodynamical models of turbulence in protoplanetary disks I. A cylindrical potential on a Cartesian grid and transport of solids
• High accretion rates in magnetised Keplerian discs mediated by a Parker instability driven dynamo
• Saturation of the Turbulent Dynamo
• Turbulent diffusion in protoplanetary discs: the effect of an imposed magnetic field
• Magnetic Field Generation in Stars
• Turbulence from localized random expansion waves
• A three-phase amplification of the cosmic magnetic field in galaxies
• Introducing SPHINX-MHD: The Impact of Primordial Magnetic Fields on the First Galaxies, Reionization, and the Global 21cm Signal
• Amplification of Interstellar Magnetic Fields and Turbulent Mixing by Supernova-Driven Turbulence Part II - The Role of Dynamical Chaos
• Magnetic Field Amplification by Turbulence in A Relativistic Shock Propagating through An Inhomogeneous Medium
• From primordial seed magnetic fields to the galactic dynamo
• Planetesimal and Protoplanet Dynamics in a Turbulent Protoplanetary Disk: Ideal Unstratified Disks
• Cosmic ray confinement in fossil cluster bubbles
• Influence of a coronal envelope as a free boundary to global convective dynamo simulations
• Simulating field-aligned diffusion of a cosmic ray gas
• The small-scale dynamo: Breaking universality at high Mach numbers
• On shocks driven by high-mass planets in radiatively inefficient disks. II. Three-dimensional global disk simulations
• Magnetic fields in the Milky Way from pulsar observations: effect of the correlation between thermal electrons and magnetic fields
• Hydrodynamic and hydromagnetic energy spectra from large eddy simulations
• Traces of large-scale dynamo action in the kinematic stage
• Small-Scale Dynamo in Supernova-Driven Interstellar Turbulence
• Fundamental scales in the kinematic phase of the turbulent dynamo
• Galactic magnetic fields and hierarchical galaxy formation
• Faraday rotation signatures of fluctuation dynamos in young galaxies
• The small-scale dynamo in a multiphase supernova-driven medium
• Polymeric jets throw light on the origin and nature of the forest of solar spicules
• On shocks driven by high-mass planets in radiatively inefficient disks. I. Two-dimensional global disk simulations
• Varying the forcing scale in low Prandtl number dynamos
• A novel type of intermittency in a nonlinear dynamo in a compressible flow
• Effects of multiple-scale driving on turbulence statistics
• Modelling supernova driven turbulence
• On Shocks Driven by High-mass Planets in Radiatively Inefficient Disks. III. Observational Signatures in Thermal Emission and Scattered Light
• Numerical viscosity and resistivity in MHD turbulence simulations
• Spectral characterisation of inertial particle clustering in turbulence
• On the Inverse Transfer of (Non-)Helical Magnetic Energy in a Decaying Magnetohydrodynamic Turbulence
• Dynamo effect in unstirred self-gravitating turbulence
• Growth or Decay -- I: universality of the turbulent dynamo saturation
• Dust growth by accretion of molecules in supersonic interstellar turbulence
• On the existence of shear-current effects in magnetized burgulence
• Critical magnetic Reynolds number of the turbulent dynamo in collisionless plasmas
• The nature of turbulence in OMC1 at the star forming scale: observations and simulations
• Quantifying the effect of turbulent magnetic diffusion on the growth rate of the magneto-rotational instability
• Numerical dependencies of the galactic dynamo in isolated galaxies with SPH
• Coagulation of inertial particles in supersonic turbulence
• Vorticity and magnetic dynamo from subsonic expansion waves
• AHKASH: a new Hybrid particle-in-cell code for simulations of astrophysical collisionless plasma
• Magnetic field amplification during a turbulent collapse
• Supernova-driven interstellar turbulence and the galactic dynamo
• Taking control of compressible modes: bulk viscosity and the turbulent dynamo
• On the saturation mechanism of the fluctuation dynamo at ${\text{Pr}}_{\mathrm{M}}\ge 1$
• Saturation mechanism of the fluctuation dynamo in supersonic turbulent plasmas
• Turbulence and order in magnetized flowing plasmas