Kinematic dynamos in multiple scale flows

Details Kinematic dynamos in multiple scale flows Kinematic dynamos in multiple scale flows

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007njph....9..290t&link_type=abstract

New Journal of Physics, Volume 9, Issue 8, pp. 290 (2007).

Physics

3

Scientific paper

A 2D periodic flow is investigated in kinematic dynamo simulations as a model for a turbulent flow. The flow is a superposition of periodic arrays of right handed helices. The arrays have different periodicity lengths but contain eddies of identical helicity. These model flows reproduce the multiple scale character of helical turbulence. Numerical calculations are used to investigate whether adding small scale turbulence to a large scale flow improves or deteriorates the ability of the flow to generate magnetic fields. Two different, sometimes competing effects are revealed. The small scale eddies can in suitable geometries be more efficient at producing magnetic fields than the large scale eddies, but the distortion of the magnetic field caused by the small eddies is detrimental to the dynamo action of the large eddies.

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