Generation of axisymmetric modes in cylindrical kinematic mean-field dynamos of VKS type - Archive ouverte HAL Access content directly
Journal Articles Geophysical and Astrophysical Fluid Dynamics Year : 2010

Generation of axisymmetric modes in cylindrical kinematic mean-field dynamos of VKS type

(1) , (2, 3) , (4) , (2, 5) , (2) , (1) , (1) , (6) , (2, 7)
1
2
3
4
5
6
7

Abstract

In an attempt to understand why the dominating magnetic field observed in the von-Kaacutermaacuten-sodium (VKS) dynamo experiment is axisymmetric, we investigate in the present article the ability of mean field models to generate axisymmetric eigenmodes in cylindrical geometries. An agr-effect is added to the induction equation and we identify reasonable and necessary properties of the agr distribution so that axisymmetric eigenmodes are generated. The parametric study is done with two different simulation codes. We find that simple distributions of agr-effect, either concentrated in the disk neighborhood or occupying the bulk of the flow, require unrealistically large values of the parameter agr to explain the VKS observations.

Dates and versions

insu-00548627 , version 1 (20-12-2010)

Identifiers

Cite

A. Giesecke, C. Nore, F. Plunian, R. Laguerre, C. Ribeiro, et al.. Generation of axisymmetric modes in cylindrical kinematic mean-field dynamos of VKS type. Geophysical and Astrophysical Fluid Dynamics, 2010, 104, pp.249-271. ⟨10.1080/03091920903366303⟩. ⟨insu-00548627⟩
186 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More