 |
Free and accessible knowledge |
Journal articles
Dynamo effect in parity-invariant flow with large and moderate separation of scales
Abstract : It is shown that non-helical (more precisely, parity-invariant) flows capable of sustaining a large-scale dynamo by the negative magnetic eddy diffusivity effect are quite common. This conclusion is based on numerical examination of a large number of randomly selected flows. Few outliers with strongly negative eddy diffusivities are also found, and they are interpreted in terms of the closeness of the control parameter to a critical value for generation of a small-scale magnetic field. Furthermore, it is shown that, for parity-invariant flows, a moderate separation of scales between the basic flow and the magnetic field often significantly reduces the critical magnetic Reynolds number for the onset of dynamo action.
https://hal.archives-ouvertes.fr/hal-00007676
Contributor : Import Arxiv Connect in order to contact the contributor
Submitted on : Monday, July 25, 2005 - 10:41:41 PM
Last modification on : Monday, July 27, 2020 - 1:26:04 PM
Contributor : Import Arxiv Connect in order to contact the contributor
Submitted on : Monday, July 25, 2005 - 10:41:41 PM
Last modification on : Monday, July 27, 2020 - 1:26:04 PM
Links full text
