Lagrangian Statistical Theory of Anisotropic MHD Turbulence
Lagrangian Statistical Theory of Anisotropic MHD Turbulence
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各向异性 MHD 湍流的拉格朗日统计理论
DOI：
10.1093/pasj/54.6.1065
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Kunji Nakayama
中科院分区：
文献类型：
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作者：
Kunji Nakayama
我们建立了一个拉格朗日统计理论的空间均匀，各向异性，和强湍流的不可压缩磁流体与均匀平均磁场。我们处理剪切阿尔芬湍流，也就是说，扰动的速度场和磁场被假定为正交的平均磁场。扰动能量，但是，不需要等分;我们的理论涵盖非均分湍流以及均分湍流。我们指出，关于惯性涡的弛豫和能量传递，剪切Alfven湍流具有以下基本性质：惯性涡的弛豫由最大的（含能量）涡流;由于平行于平均场的级联的抑制，能量级联在空间上具有准二维性质;因此，不可避免地导出了-3/2幂律能谱。这些性质与湍流是否满足能量均分无关。因此，我们断言，他们应该被认为是一般的和强大的性质的强MHD湍流。
We construct a Lagrangian statistical theory of spatially uniform, anisotropic, and strong turbulence of an incompressible magneto-fluid with a uniform mean magnetic field. We treat shear Alfven turbulence; that is, the perturbations of the velocity field and the magnetic field are assumed to be orthogonal to the mean magnetic field. The perturbation energies, however, need not be equiparted; our theory covers non-equipartition turbulence as well as equipartition turbulence. We show that, concerning the relaxation and energy-transfer of inertial-range eddies, the shear Alfven turbulence has the following fundamental properties: That is, relaxation of inertial-range eddies is dominated by the largest (energy-containing) eddies; energy cascades have spatially a quasi 2-dimensional nature because of the inhibition of cascades parallel to the mean field; thus, inevitably, the −3/2 power-law energy-spectra are derived. These properties are independent of whether the turbulence satisfies the energy equipartition. We, therefore, assert that they should be thought of as generic and robust natures of strong MHD turbulence.
拉格朗日重正化近似中的磁流体动力湍流谱
DOI：
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发表时间：
2005
期刊：
影响因子：
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作者：
T. Ishihara;Y. Kaneda;Y. Kaneda;T. Ishida and Y. Kaneda;吉田恭;K. Yoshida
通讯作者：
K. Yoshida