Coherent structure of zonal flow and onset of turbulent transport
Coherent structure of zonal flow and onset of turbulent transport
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DOI：
10.1063/1.1922788
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发表时间：
2005-02
影响因子：
2.2
通讯作者：
K. Itoh;K. Hallatschek;S. Itoh;P. Diamond;S. Toda
中科院分区：
文献类型：
--
作者：
K. Itoh;K. Hallatschek;S. Itoh;P. Diamond;S. Toda
分析了磁化等离子体中漂移波频率范围内的湍流和纬向流的激发。介绍了层状流驱动的非线性稳定效应，得到了层状流驱动的稳态解。得到了湍流输运发生的条件，导出了波动能量在湍流和纬向流中的分配比。得到了考虑纬向流影响的湍流输运系数。分析结果与直接数值模拟结果吻合较好。
Excitation of the turbulence in the range of drift wave frequency and zonal flow in magnetized plasmas is analyzed. Nonlinear stabilization effect on zonal flow drive is introduced, and the steady state solution is obtained. The condition for the onset of turbulent transport is obtained and partition ratio of fluctuation energy into turbulence and zonal flows is derived. The turbulent transport coefficient, which includes the effect of zonal flow, is also obtained. Analytic result and direct numerical simulation show a good agreement.