Record number :
77055
Title of article :
Numerical simulations of kinematic dynamo action
Author/Authors :
Archontis، V. نويسنده , , Dorch، S. B. F. نويسنده , , Nordlund، ?. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
-392
From page :
393
To page :
0
Abstract :
Numerical simulations of kinematic dynamo action in steady and three-dimensional ABC flows are presented with special focus on the difference in growth rates between cases with single and multiple periods of the prescribed velocity field. It is found that the difference in growth rate (apart from a trivial factor stemming from a scaling of the rate of strain with the wavenumber of the velocity field) is due to differences in the recycling of the weakest part of the magnetic field. The single wavelength classical ABC-flow experiments impose stronger symmetry requirements, which results in a suppression of the growth rate. The experiments with larger wave number achieve growth rates that are more compatible with the turn-over time scale by breaking the symmetry of the resulting dynamo-generated magnetic field. Differences in topology in cases with and without stagnation points in the imposed velocity field are also investigated, and it is found that the cigar-like structures that develop in the classical A=B=C dynamos are replaced by ribbon structures in cases where the flow is without stagnation points.
Keywords :
DIISOCYANATES , medical , OCCUPATIONAL ASTHMA , Surveillance
Journal title :
Astronomy and Astrophysics
Serial Year :
2003
Link To Document :
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