A-priori study of the subgrid energy transfers for small-scale dynamo in kinematic and saturation regimes

Gerardus Petrus Offermans, Luca Biferale, M. Buzzicotti, Moritz Linkmann

Research output: Contribution to journalArticlepeer-review

Abstract

The statistical properties of the subgrid energy transfers of homogeneous small-scale dynamo areinvestigated during the kinematic, nonlinear and statistically saturated stages. We carry out ana priorianalysis of data obtained from an ensemble of direct numerical simulations on 5123gridpoints and at unity magnetic Prandtl number. In order to provide guidance for subgrid-scale (SGS)modelling of different types of energy transfer that occur in magnetohydrodynamic dynamos, weconsider the SGS stress tensors originating from inertial dynamics, Lorentz force and the magneticinduction separately. We find that all SGS energy transfers display some degree of intermittencyas quantified by the scale-dependence of their respective probability density functions. Concerningthe inertial dynamics, a depletion of intermittency occurs in presence of a saturated dynam
Original languageEnglish
Article number122307
Number of pages17
JournalPhysics of Plasmas
Volume25
Issue number12
Early online date18 Dec 2018
DOIs
Publication statusPublished - 31 Dec 2018

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