Dynamo enhancement and mode selection triggered by high magnetic permeability
Abstract
We present results from consistent dynamo simulations, where the electrically conducting and incompressible flow inside a cylinder vessel is forced by moving impellers numerically implemented by a penalization method. The numerical scheme models jumps of magnetic permeability for the solid impellers, resembling various configurations tested experimentally in the von-Karman Sodium experiment. The most striking experimental observations are reproduced in our set of simulations. In particular, we report on the existence of an axisymmetric dynamo mode, self-consistently generated when the magnetic permeability of the impellers exceeds a threshold. We describe a possible scenario involving both the turbulent flow in the vicinity of the impellers and the high magnetic permeability of the impellers.
Cite
@article{arxiv.1706.00260,
title = {Dynamo enhancement and mode selection triggered by high magnetic permeability},
author = {Sophia Kreuzahler and Yannick Ponty and Nicolas Plihon and Holger Homann and Rainer Grauer},
journal= {arXiv preprint arXiv:1706.00260},
year = {2021}
}
Comments
5 pages, 4 figures