The effect of background flow shear on gyrokinetic turbulence in the cold ion limit

The effect of background flow shear on gyrokinetic turbulence in the cold ion limit
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冷离子极限下背景流剪切对回旋湍流的影响

DOI:
10.1088/1361-6587/ab1320
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发表时间:
2019
影响因子:
2.2
通讯作者:
Ball J
Ball J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ball J

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冷离子限制的本地gyrokinetic模型严格采取产生一个非线性系统的流体方程,其中包括背景流剪切。不需要流体闭合。通过考虑一个简单的平板几何形状的磁漂移,但没有磁剪切,这些流体方程减少到Charney-Hasegawa-米马模型中存在的流动剪切。通过求解该模型的解析解,研究了E× B流剪切对单个平行速度梯度驱动模式稳定性的影响。此外,还利用该模型研究了背景E× B流切变对基本三模非线性耦合的影响,揭示了纬向和非纬向模式之间的差异。这些分析结果与陀螺动力学模拟一致,可以作为基准的流动剪切和非线性耦合的数值实现。
The cold ion limit of the local gyrokinetic model is rigorously taken to produce a nonlinear system of fluid equations that includes background flow shear. No fluid closure is required. By considering a simple slab geometry with magnetic drifts, but no magnetic shear, these fluid equations reduce to the Charney–Hasegawa–Mima model in the presence of flow shear. Analytic solutions to this model are found to study the impact of E× B flow shear on the stability of a single parallel velocity gradient driven mode. Additionally, the model is used to investigate the effect of background E× B flow shear on the basic three-mode nonlinear coupling, which reveals differences between zonal and non-zonal modes. These analytic results agree with gyrokinetic simulations and can serve to benchmark the numerical implementation of flow shear and nonlinear coupling.
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