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A new mean‐field plasma edge transport model based on turbulent kinetic energy and enstrophy
Contributions to Plasma Physics ( IF 1.6 ) Pub Date : 2020-01-13 , DOI: 10.1002/ctpp.201900156
Reinart Coosemans 1 , Wouter Dekeyser 1 , Martine Baelmans 1
Affiliation  

The predictive capabilities of mean‐field plasma edge transport codes are significantly reduced by the empirically determined radial diffusion coefficients commonly used to account for the turbulent transport. This paper aims to assess a two‐equation model including both turbulent kinetic energy and turbulent enstrophy for an improved description of the mean‐field turbulent transport. A turbulent enstrophy equation is analytically derived for isothermal, electrostatic, two‐dimensional, interchange‐dominated ExB turbulence in the scrape‐off layer. Evaluation of this equation shows that interchange is the dominant source, while the sheath loss and viscous terms provide the main sinks of turbulent enstrophy. Transport effects turn out to be of minor importance. A model for the combined turbulent kinetic energy and enstrophy equations and the particle transport is constructed starting from a one‐equation model for the turbulent kinetic energy. The resulting two‐equation model is shown to retain the dominant dynamics of the latter while improving its scalings.

中文翻译:

基于湍动能和涡旋的新型平均场等离子体边缘传输模型

通过经验确定的径向扩散系数(通常用于解释湍流传输)会大大降低平均场等离子体边缘传输代码的预测能力。本文旨在评估包括湍动能和湍流涡流在内的两方程模型,以更好地描述平均场湍流传输。对于刮擦层中的等温,静电,二维,交换主导的ExB湍流,解析地得出了湍流涡旋方程。对这个方程式的评估表明,交换是主要来源,而鞘管损失和粘性项则是湍流回旋的主要汇源。事实证明,运输效应并不重要。从湍流动能的单方程模型开始,构建了一个由湍流动能和涡流方程组成的模型和粒子传输。结果表明,两方程模型保留了后者的主导动力学,同时改善了其缩放比例。
更新日期:2020-01-13
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