Dynamo action at low magnetic Prandtl numbers: mean flow vs. fully turbulent motion
流体动力学
2016-08-16 v1
摘要
We compute numerically the threshold for dynamo action in Taylor-Green swirling flows. Kinematic calculations, for which the flow field is fixed to its time averaged profile, are compared to dynamical runs for which both the Navier-Stokes and the induction equations are jointly solved. The kinematic instability is found to have two branches, for all explored Reynolds numbers. The dynamical dynamo threshold follows these branches: at low Reynolds number it lies within the low branch while at high kinetic Reynolds number it is close to the high branch.
引用
@article{arxiv.physics/0601105,
title = {Dynamo action at low magnetic Prandtl numbers: mean flow vs. fully turbulent motion},
author = {Yannick Ponty and Pablo Mininni and Jean-François Pinton and Hélène Politano and Annick Pouquet},
journal= {arXiv preprint arXiv:physics/0601105},
year = {2016}
}
备注
4 pages, 4 figures