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Variational mean-fluctuation splitting and drift-fluid models

Tronci, Cesare (2020) Variational mean-fluctuation splitting and drift-fluid models

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After summarizing the variational approach to splitting mean flow and fluctuation kinetics in the standard Vlasov theory, the same method is applied to the drift-kinetic equation from Littlejohn’s theory of guiding-center motion. This process sheds a new light on driftordered fluid (drift-fluid) models, whose anisotropic pressure tensor is then considered in detail. In addition, current drift-fluid models are completed by the insertion of magnetization terms ensuring momentum conservation. Magnetization currents are also shown to lead to challenging aspects when drift-fluid models are coupled to Maxwell’s equations for the evolution of the electromagnetic field. In order to overcome these difficulties, a simplified guiding-center theory is proposed along with its possible applications to hybrid kinetic-fluid models.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mathematics
Authors :
Date : 18 February 2020
Funders : Alexander von Humboldt Foundation, German Federal Ministry for Education and Research.
OA Location :
Depositing User : James Marshall
Date Deposited : 03 Mar 2020 09:28
Last Modified : 03 Mar 2020 09:28

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