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Rôle de la turbulence sur l'effet dynamo et l'induction magnétique

Abstract : The effect of velocity fluctuations on the threshold of the dynamo effect, the magnetic induction, and also the non-linear behaviors in the saturation regime are analysed through a list of eight articles selected. These subjects are studied by numerical simulations in a three-dimensional periodic domain. Direct numerical simulation (DNS) and simulation using sub-grid scale modeling methods (LES), helped to highlight the effect of fluctuations on the threshold and many modes of dynamo in flows sustained with different forcings (Taylor-Green, ABC and G.O. Robert). In these systems in the saturation regime, non-linear effects appear, such as sub-critical bifurcations associated with hysteresis loops, and turbulent intermittent On-Off behaviors. A discussion and perspectives on these topics are presented, together with a long annexe describing the numerical methods and diagnostics that were used in this work.
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https://tel.archives-ouvertes.fr/tel-00922148
Contributor : Yannick Ponty Connect in order to contact the contributor
Submitted on : Monday, December 23, 2013 - 8:57:29 PM
Last modification on : Thursday, August 4, 2022 - 4:55:17 PM
Long-term archiving on: : Monday, March 24, 2014 - 9:51:35 AM

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  • HAL Id : tel-00922148, version 1

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Yannick Ponty. Rôle de la turbulence sur l'effet dynamo et l'induction magnétique. Mécanique des fluides [physics.class-ph]. Université Nice Sophia Antipolis, 2012. ⟨tel-00922148⟩

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