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Variational mean-fluctuation splitting and drift-fluid models

机译:变形平均波动分裂和漂移流体模型

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摘要

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 drift-ordered 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.
机译:总结了在标准Vlasov理论中分裂平均流量和波动动力学的分解方法之后,将相同的方法应用于LittleJohn的引导中心运动理论的漂移动力学方程。 该过程在漂移有序的流体(漂移流体)模型上缩小了一种新的光,然后详细考虑其各向异性压力张量。 此外,通过插入确保动量保守的磁化术语来完成电流漂移流体模型。 当漂移流体模型耦合到Maxwerwerver的方程时,还示出了磁化电流导致挑战性方面。 为了克服这些困难,提出了一种简化的引导中心理论,以及其可能的应用于混合动力学流体模型。

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