Non-perturbative models of intermittency in drift-wave turbulence: towards a probabilistic theory of anomalous transport

Non-perturbative models of intermittency in drift-wave turbulence: towards a probabilistic theory of anomalous transport
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漂移波湍流间歇性的非微扰模型：异常输运的概率理论

DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Smolyakov
A. Smolyakov
中科院分区：
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文献类型：
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作者：
Eun Jin Kim;P. Diamond;M. Malkov;T. Hahm;K. Itoh;S. Itoh;S. Champeaux;I. Gruzinov;Ö. Gürcan;C. Holland;M. Rosenbluth;A. Smolyakov

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给出了漂移波 (DW) 湍流间歇性非微扰模型的两个例子。第一个是计算由离子温度梯度湍流中的结构引起的离子热通量的概率分布函数 (PDF)。瞬子微积分预测 PDF 是一个拉伸指数。第二个是双变量 Burgers 方程的推导，该方程用于在存在径向延伸的拖缆流的情况下 DW 种群密度的演化。确定波动强度雪崩的 PDF。讨论了模拟中观察到的这与湍流扩散的关系。
Two examples of non-perturbative models of intermittency in drift-wave (DW) turbulence are presented. The first is a calculation of the probability distribution function (PDF) of ion heat flux due to structures in ion temperature gradient turbulence. The instanton calculus predicts the PDF to be a stretched exponential. The second is a derivation of a bi-variate Burgers equation for the evolution of the DW population density in the presence of radially extended streamer flows. The PDF of fluctuation intensity avalanches is determined. The relation of this to turbulence spreading, observed in simulations, is discussed.