天体涡旋的饱和: 以无余弦流为例的数值实验
天体物理学
2015-10-14 v1 计算物理
流体动力学
地球物理
等离子体物理
空间物理
摘要
In the context of astrophysical dynamos we illustrate that the no-cosines flow, with zero mean helicity, can drive fast dynamo action and study the dynamo's mode of operation during both the linear and non-linear saturation regime: It turns out that in addition to a high growth rate in the linear regime, the dynamo saturates at a level significantly higher than normal turbulent dynamos, namely at exact equipartition when the magnetic Prandtl number is on the order of unity. Visualization of the magnetic and velocity fields at saturation will help us to understand some of the aspects of the non-linear dynamo problem.
引用
@article{arxiv.astro-ph/0409193,
title = {On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-cosines flow},
author = {S. B. F. Dorch and V. D. Archontis},
journal= {arXiv preprint arXiv:astro-ph/0409193},
year = {2015}
}
备注
8 pages, 5 figures, submitted to the proceedings of "Space Climate 1" to be peer-reviewed to Solar Physics