Dispersion by random velocity fields

Dispersion by random velocity fields
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随机速度场的色散

DOI:
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发表时间:
1975
影响因子:
3.7
通讯作者:
R. Phythian
R. Phythian
中科院分区:
工程技术2区
文献类型:
--
作者:
R. Phythian

文献摘要

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当速度场的概率分布为高斯分布、均匀分布、各向同性分布、平稳分布和零均值分布时,对随机运动的不可压缩流体中有标记粒子的分散问题提出了一个简单的近似。给出了拉格朗日速度相关函数和色散的近似,并与克雷契南的精确计算机计算进行了比较。除了与时间无关的速度场和奇异波数谱函数外,两者的一致性较好。
A simple approximation is proposed for the problem of the dispersion of marked particles in an incompressible fluid in random motion when the probability distribution of the velocity field is taken as Gaussian, homogeneous, isotropic, stationary and of zero mean. Approximations for the Lagrangian velocity correlation function and the dispersion are given and compared with exact computer calculations of Kraichnan. Agreement is found to be good except for time-independent velocity fields and singular wavenumber spectral functions.