Renormalization theory for eddy diffusivity in turbulent transport.
Renormalization theory for eddy diffusivity in turbulent transport.
复制标题
湍流传输中涡扩散率的重正化理论。
DOI:
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发表时间:
1992
影响因子:
8.6
通讯作者:
A. Majda
中科院分区:
文献类型:
--
作者:
Marco Avellaneda;A. Majda
We examine the derivation of eddy-diffusivity equations for transport of passive scalars in a turbulent velocity field. Our main contention is that, in the long-time-large-distance limit, the eddy-diffusivity equations can take very different forms according fo the statistical properties of the subgrid velocity, and that these equations depend very sensitively on the interplay between spatial and temporal velocity fluctuations. Such crossovers can be represented in a «phase diagram» involving two relevant statistical parameters.