On the magnetic fields generated by experimental dynamos

Abstract

We review the results obtained by three successful fluid dynamo experiments and discuss what has been learnt from them about the effect of turbulence on the dynamo threshold and saturation. We then discuss several questions that are still open and propose experiments that could be performed to answer some of them.

40 pages, 13 figures

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• Scaling laws of turbulent dynamos
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Cited by in corpus (35)

• Magnetohydrodynamic experiments on cosmic magnetic fields
• Dynamo regimes and transitions in the VKS experiment
• History and results of the Riga dynamo experiments
• Reversals of a large scale field generated over a turbulent background
• Role of soft-iron impellers on the mode selection in the VKS dynamo experiment
• Bistability and chaos in Taylor-Green dynamo
• Impact of impellers on the axisymmetric magnetic mode in the VKS2 dynamo experiment
• Axial dipolar dynamo action in the Taylor-Green vortex
• A numerical model of the VKS experiment
• Influence of an external magnetic field on forced turbulence in a swirling flow of liquid metal
• Zonal shear and super-rotation in a magnetized spherical Couette flow experiment
• 3D Simulations of Oxygen Shell Burning with and without Magnetic Fields
• Weak turbulence theory for rotating magnetohydrodynamics and planetary dynamos
• Electromagnetic induction in non-uniform domains
• Bypassing Cowling's theorem in axisymmetric fluid dynamos
• Intermittency in spherical Couette dynamos
• Numerical study of impeller-driven von Karman flows via a volume penalization method
• Dynamo enhancement and mode selection triggered by high magnetic permeability
• Kinematic dynamo action of a precession driven flow based on the results of water experiments and hydrodynamic simulations
• Generation of axisymmetric modes in cylindrical kinematic mean-field dynamos of VKS type
• Anomalous exponents at the onset of an instability
• Transition to turbulent dynamo saturation
• The onset of turbulent rotating dynamos at the low $Pm$ limit
• The role of boundary conditions on helicoidal flow collimation: consequences for the Von-Kármán-Sodium dynamo experiment
• Optimum reduction of the dynamo threshold by a ferromagnetic layer located in the flow
• Coexisting stochastic and coherence resonance in a mean-field dynamo model for Earth's magnetic field reversals
• Enhanced dynamo growth in nonhomogeneous conducting fluids
• Effects of turbulence, resistivity and boundary conditions on helicoidal flow collimation: consequences for the Von-Kármán-Sodium dynamo experiment
• Large scale fluctuations and dynamics of the Bullard - von Kármán dynamo
• Magnetic material in mean-field dynamos driven by small scale helical flows
• Critical exponents in zero dimensions
• Self-consistent simulations of a von Kármán type dynamo in a spherical domain with metallic walls
• Dynamo saturation down to vanishing viscosity: strong-field and inertial scaling regimes
• Decay rates of magnetic modes below the threshold of a turbulent dynamo
• Parametric study and optimization trends for the Von-Kármán-Sodium dynamo experiment