A non-helical dynamo - MHD simulations of dynamo action by a non-helical flow

Details A non-helical dynamo - MHD simulations of dynamo action by a non-helical flow A non-helical dynamo - MHD simulations of dynamo action by a non-helical flow

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..136a&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

We performed numerical 3-d MHD simulations to study whether or not the presence of helicity is a necessary ingredient for fast dynamo action. A steady 3-d flow with no mean helicity is used and is turned out that apart from the high growth rate in the linear regime the dynamo saturates at a level significantly higher that the intermittent turbulent dynamos. It becomes clear from this example that the precense of a mean helicity is not at all a requirement for dynamo action but it is rather the stretching ability of the flow that amplifies the magnetic energy in an exponential manner.

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