Model of intermittency in magnetohydrodynamic turbulence.
Model of intermittency in magnetohydrodynamic turbulence.
复制标题
磁流体动力湍流的间歇模型。
DOI：
10.1103/physreve.52.636
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
A. Pouquet
中科院分区：
文献类型：
--
作者：
H. Politano;A. Pouquet
在磁流体动力学（MHD）的情况下，我们推广了一个由She和L 'ev ' eque [Phys]提出的最近的间歇性模型。教化。72,336(1994)]。我们在Iroshnikov-Kraichnan MHD湍流理论框架内建立的模型依赖于两个参数，当耗散结构的特征标度为0时，这些参数与耗散结构的异常标度定律有关。与发表的来自航天器观测太阳风的数据进行简短的比较表明，这是一个可行的模型，并且在该模型的框架内，MHD湍流的耗散结构是片状的，正如最近在中等雷诺数的三维数值模拟中观察到的那样。
We extend to the magnetohydrodynamic (MHD) case a recent model of intermittency due to She and L\'ev\^eque [Phys. Rev. Lett. 72, 336 (1994)]. The model that we develop in the framework of the Iroshnikov-Kraichnan theory of MHD turbulence depends on two parameters that are linked to anomalous scaling laws of dissipative structures when their characteristic scale l\ensuremath{\rightarrow}0. A brief comparison with published data stemming from spacecraft observations within the solar wind shows that it is a workable model and that within the framework of the model, dissipative structures in MHD turbulence are sheetlike, as observed in recent numerical simulations in three dimensions at moderate Reynolds numbers.