The problem of the dynamo effect for a Kraichnan incompressible helicity-free velocity field is considered. Exploiting a quantum formalism first introduced by Kazantsev (A.P. Kazantsev, Sov. Phys. JETP 26, 1031-1034 (1968)), we show that a critical magnetic Reynolds number exists for the presence of dynamo. The value of the Prandtl number...
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2002 (v1)Journal articleUploaded on: December 4, 2022
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2002 (v1)Journal article
We consider the decay of a passive scalar in a rough turbulent flow...
Uploaded on: December 3, 2022 -
2006 (v1)Journal article
The growth of magnetic fluctuations in the inertial range of turbulence is investigated in terms of fluid particle dynamics. The existence of dynamo effect is related to the time behaviour of the correlations between tangent vectors evolving along Lagrangian trajectories. In the presence of dynamo effect, the correlations between tangent...
Uploaded on: December 3, 2022 -
2005 (v1)Journal article
The effects of a large-scale shear on the energy spectrum of a passively advected scalar field are investigated. The shear is superimposed on a turbulent isotropic flow, yielding an Obukhov-Corrsin $k^{-5/3}$ scalar spectrum at small scales. Shear effects appear at large scales, where a different, anisotropic behavior is observed. The scalar...
Uploaded on: December 4, 2022 -
2022 (v1)Publication
Corrigendum to a paper
Uploaded on: February 13, 2024