Mean-field concept and direct numerical simulations of rotating magnetoconvection and the geodynamo

Abstract

A comparison is made between mean-field models and direct numerical simulations of rotating magnetoconvection and the geodynamo. The mean-field coefficients are calculated with the fluid velocity taken from the direct numerical simulations. The magnetic fields resulting from mean-field models are then compared with the mean magnetic field from the direct numerical simulations.

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Cited by in corpus (120)

• Dynamo theories
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• Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
• Alpha effect and turbulent diffusion from convection
• Multiple dynamo modes as a mechanism for long-term solar activity variations
• Magnetohydrodynamic experiments on cosmic magnetic fields
• Astrophysical turbulence modeling
• Advances in mean-field dynamo theory and applications to astrophysical turbulence
• Memory effects in turbulent transport
• Characterizing the mean-field dynamo in turbulent accretion disks
• Oscillatory dynamos and their induction mechanisms
• Mean--field electrodynamics: Critical analysis of various analytical approaches to the mean electromotive force
• Large-scale dynamos in rigidly rotating turbulent convection
• Galactic Dynamos
• Turbulent transport coefficients in spherical wedge dynamo simulations of solar-like stars
• Test-field method for mean-field coefficients with MHD background
• Catastrophic quenching in alpha-Omega dynamos revisited
• Spoke-like differential rotation in a convective dynamo with a coronal envelope
• Evolution of solar and stellar dynamo theory
• Alpha effect and diffusivity in helical turbulence with shear
• Magnetic field amplification in accretion discs around the first stars: implications for the primordial IMF
• Dynamo cycles in global convection simulations of solar-like stars
• The negative effective magnetic pressure in stratified forced turbulence
• Global dynamo models from direct numerical simulations and their mean-field counterparts
• Influence of a coronal envelope as a free boundary to global convective dynamo simulations
• Modeling spatio-temporal nonlocality in mean-field dynamos
• Cosmic ray current-driven turbulence and mean-field dynamo effect
• Characterisation of the turbulent electromotive force and its magnetically-mediated quenching in a global EULAG-MHD simulation of solar convection
• Dipolar dynamos in stratified systems
• Magnetic helicity fluxes in an alpha-squared dynamo embedded in a halo
• Advances in theory and simulations of large-scale dynamos
• A growing dynamo from a saturated Roberts flow dynamo
• Turbulent diffusion with rotation or magnetic fields
• Mean-field transport in stratified and/or rotating turbulence
• Dynamo action and magnetic buoyancy in convection simulations with vertical shear
• The alpha effect with imposed and dynamo-generated magnetic fields
• Amplification and stability of magnetic fields and dynamo effect in young A stars
• Alpha effect due to buoyancy instability of a magnetic layer
• The influence of accretion disk thickness on the large-scale magnetic dynamo
• Star-in-a-box simulations of fully convective stars
• Pumping velocity in homogeneous helical turbulence with shear
• Topology and field strength in spherical, anelastic dynamo simulations
• Effects of a subadiabatic layer on convection and dynamos in spherical wedge simulations
• Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection
• New scaling for the alpha effect in slowly rotating turbulence
• Reynolds stresses from hydrodynamic turbulence with shear and rotation
• The supernova-regulated ISM. III. Generation of vorticity, helicity and mean flows
• Characterising the Dynamo in a Radiatively Inefficient Accretion Flow
• On the problem of large-scale magnetic field generation in rotating compressible convection
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• Stellar dynamos in the transition regime: multiple dynamo modes and anti-solar differential rotation
• Turbulent processes and mean-field dynamo
• Reversals in nature and the nature of reversals
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• Mean-field effects in the Galloway-Proctor flow
• The kinetic helicity needed to drive large-scale dynamos
• Saturation and time dependence of geodynamo models
• Calibrating passive scalar transport in shear-flow turbulence
• Systematic parameter study of dynamo bifurcations in geodynamo simulations
• Mean-field diffusivities in passive scalar and magnetic transport in irrotational flows
• Transition from multipolar to dipolar dynamos in stratified systems
• The role of the Yoshizawa effect in the Archontis dynamo
• Turbulent transport coefficients in galactic dynamo simulations using singular value decomposition
• Rotational dependence of turbulent transport coefficients in global convective dynamo simulations of solar-like stars
• Magnetic fields from low mass stars to brown dwarfs
• Compressibility in turbulent MHD and passive scalar transport: mean-field theory
• The Elemental Shear Dynamo
• A mean field dynamo from negative eddy diffusivity
• Turbulent viscosity and effective magnetic Prandtl number from simulations of isotropically forced turbulence
• Turbulent transport in hydromagnetic flows
• The Effect of Velocity Shear on Dynamo Action Due to Rotating Convection
• Magnetic and rotational quenching of the $\Lambda$ effect
• Spontaneous chiral parity breaking by hydromagnetic buoyancy
• The fratricide of alpha-Omega dynamos by their alpha-squared siblings
• Simulations of galactic dynamos
• Compressible test-field method and its application to shear dynamos
• Diffusion of large-scale magnetic fields by reconnection in MHD turbulence
• Interaction of large- and small-scale dynamos in isotropic turbulent flows from GPU-accelerated simulations
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• Non-locality of the Turbulent Electromotive Force
• Rotational threshold in global numerical dynamo simulations
• Finite-time response of dynamo mean-field effects in magnetorotational turbulence
• The fate of alpha dynamos at large $Rm$
• On global solar dynamo simulations
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• The contribution of kinetic helicity to turbulent magnetic diffusivity
• An advective solar-type dynamo without the alpha effect
• Low inertia reversing geodynamos
• A new constraint on mean-field galactic dynamo theory
• On the existence of shear-current effects in magnetized burgulence
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• Long-term variations of turbulent transport coefficients in a solar-like convective dynamo simulation
• Iterative removal of sources to model the turbulent electromotive force
• Quantifying the effect of turbulent magnetic diffusion on the growth rate of the magneto-rotational instability
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• Scaling of Turbulent Viscosity and Resistivity: Extracting a Scale-dependent Turbulent Magnetic Prandtl Number
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• Mode analysis of numerical geodynamo models
• Magnetic helicity fluxes in dynamos from rotating inhomogeneous turbulence
• Statistical dynamo theory: Mode excitation
• Helicity effect on turbulent passive and active scalar diffusivities
• Exploring helical dynamos with machine learning
• Mechanisms of Planetary and Stellar Dynamos
• Theory of the kinetic helicity effect on turbulent diffusion of magnetic and scalar fields
• From convective to stellar dynamos
• Simulations of astrophysical dynamos
• MRI-driven $\alpha \Omega$ dynamo at high Pm numbers
• Selection of axial dipole from a seed magnetic field in rapidly rotating dynamo models
• Investigating global convective dynamos with mean-field models: full spectrum of turbulent effects required
• Solar-like dynamos and rotational scaling of cycles from star-in-a-box simulations
• What makes a steady flow to favour kinematic magnetic field generation: A statistical analysis