Inhibition of turbulent cascade by sweep
Inhibition of turbulent cascade by sweep
复制标题
通过扫频抑制湍流级联
DOI：
10.1017/s0022377896005326
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发表时间：
1997
影响因子：
2.5
通讯作者：
R. Kraichnan
中科院分区：
文献类型：
--
作者：
Shiyi Chen;R. Kraichnan
本文研究了大尺度扫掠速度对小尺度湍流叶栅的影响，包括被动标量在多变量高斯速度场作用下的平流和不可压Alfvén波湍流。在这两种情况下，扫掠产生各向异性，降低了叶栅的强度。如果扫描速度的方向随时间变化，则在与方向变化相关的各向异性和各向同性效应之间达到平衡。
The effects of large-scale sweeping velocity on the turbulent cascade to small scales are examined for two problems: the advection of a passive scalar by a multivariate-Gaussian velocity field and incompressible Alfvén-wave turbulence. In both cases, the sweeping produces anisotropy and reduces the strength of cascade. If the direction of the sweep velocity varies with time, a balance is reached between this anisotropy and isotropizing effects associated with the change of direction.