On the self-averaging of dispersion for transport in quasi-periodic random media

On the self-averaging of dispersion for transport in quasi-periodic random media
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准周期随机介质中传输色散的自平均

DOI:
10.1088/1751-8113/40/4/002
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发表时间:
--
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
C. Vamos (2007).
C. Vamos (2007).
中科院分区:
--
文献类型:
--
作者:
IH Eberhard. J.. N. Suciu;C. Vamos (2007).

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在这项研究中,我们对非均匀介质中传输的纵向色散系数的自平均进行了数值分析。这是通过使用解析论证和数值模拟来研究有限次和有限数量的随机场的色散的均方样本到样本的涨落来实现的。我们考虑类点注入在具有高斯关联函数的准周期随机场中的输运。特别是,我们重点研究了波动的渐近和预渐近行为,借助于色散的概率密度函数,我们验证了先前在Eberhard(2004 J.Phys)中报道的样本到样本波动的对数增长。答:数学。Gen.37 2549-71)。我们还评论了在统计均匀的高斯速度场中产生输运自平均的准周期实现的相关参数的选择。
In this study we present a numerical analysis for the self-averaging of the longitudinal dispersion coefficient for transport in heterogeneous media. This is done by investigating the mean-square sample-to-sample fluctuations of the dispersion for finite times and finite numbers of modes for a random field using analytical arguments as well as numerical simulations. We consider transport of point-like injections in a quasi-periodic random field with a Gaussian correlation function. In particular, we focus on the asymptotic and pre-asymptotic behaviour of the fluctuations with the aid of a probability density function for the dispersion, and we verify the logarithmic growth of the sample-to-sample fluctuations as earlier reported in Eberhard (2004 J. Phys. A: Math. Gen. 37 2549–71). We also comment on the choice of the relevant parameters to generate quasi-periodic realizations with respect to the self-averaging of transport in statistically homogeneous Gaussian velocity fields.
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
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DOI: 10.1029/2005wr004546
发表时间: --
影响因子: 5.4
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