Liquid sodium models of the Earth's core

MM Adams, DR Stone, DS Zimmerman… - Progress in Earth and …, 2015 - Springer
Our understanding of the dynamics of the Earth's core can be advanced by a combination of
observation, experiments, and simulations. A crucial aspect of the core is the interplay …

Modes and instabilities in magnetized spherical Couette flow

A Figueroa, N Schaeffer, HC Nataf… - Journal of Fluid …, 2013 - cambridge.org
Several teams have reported peculiar frequency spectra for flows in a spherical shell. To
address their origin, we perform numerical simulations of the spherical Couette flow in a …

Turbulence reduces magnetic diffusivity in a liquid sodium experiment

S Cabanes, N Schaeffer, HC Nataf - Physical review letters, 2014 - APS
The contribution of small scale turbulent fluctuations to the induction of a mean magnetic
field is investigated in our liquid sodium spherical Couette experiment with an imposed …

Direct observation of the turbulent emf and transport of magnetic field in a liquid sodium experiment

K Rahbarnia, BP Brown, MM Clark… - The Astrophysical …, 2012 - iopscience.iop.org
For the first time, we have directly measured the transport of a vector magnetic field by
isotropic turbulence in a high Reynolds number liquid metal flow. In analogy with direct …

Impact of time-dependent nonaxisymmetric velocity perturbations on dynamo action of von Kármán-like flows

A Giesecke, F Stefani, J Burguete - … Review E—Statistical, Nonlinear, and Soft …, 2012 - APS
We present numerical simulations of the kinematic induction equation in order to examine
the dynamo efficiency of an axisymmetric von Kármán–like flow subject to time-dependent …

Turbulent magnetohydrodynamic dynamo action in a spherically bounded von Kármán flow at small magnetic Prandtl numbers

K Reuter, F Jenko, CB Forest - New Journal of Physics, 2011 - iopscience.iop.org
Turbulent magnetohydrodynamic (MHD) dynamo action in a spherically bounded electrically
conducting flow is investigated numerically. A large-scale two-vortex flow driven by a …

Pursuing the plasma dynamo and MRI in the laboratory: Hydrodynamic studies of unmagnetized plasmas at large magnetic Reynolds number

DB Weisberg - 2016 - search.proquest.com
A new method for studying flow-driven MHD instabilities in the laboratory has been
developed, using a highly conductive, low viscosity, spherical plasma. The confinement …

Role of large-scale velocity fluctuations in a two-vortex kinematic dynamo

EJ Kaplan, BP Brown, K Rahbarnia, CB Forest - Physical Review E—Statistical …, 2012 - APS
This paper presents an analysis of the Dudley-James two-vortex flow, which inspired several
laboratory-scale liquid-metal experiments, in order to better demonstrate its relation to …

Optimization of magnetic amplification by flow constraints in turbulent liquid sodium

MD Nornberg, NZ Taylor, CB Forest, K Rahbarnia… - Physics of …, 2014 - pubs.aip.org
Direct measurements of the vector turbulent emf in a driven two-vortex flow of liquid sodium
were performed in the Madison Dynamo Experiment [K. Rahbarnia et al., Astrophys. J. 759 …

Identification of vortexes obstructing the dynamo mechanism in laboratory experiments

A Limone, DR Hatch, CB Forest, F Jenko - Physics of Fluids, 2013 - pubs.aip.org
The magnetohydrodynamic dynamo effect explains the generation of self-sustained
magnetic fields in electrically conducting flows, especially in geo-and astrophysical …