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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.
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Submitted on : Monday, July 25, 2005 - 10:41:41 PM
Last modification on : Monday, July 27, 2020 - 1:26:04 PM

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V. A. Zheligovsky, O. M. Podvigina, U. Frisch. Dynamo effect in parity-invariant flow with large and moderate separation of scales. Geophysical and Astrophysical Fluid Dynamics, Taylor & Francis, 2001, 97, pp.225-248. ⟨hal-00007676⟩

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