Statistics of highly heterogeneous flow fields confined to three-dimensional random porous media
Statistics of highly heterogeneous flow fields confined to three-dimensional random porous media
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DOI：
10.1103/physreve.93.013122
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发表时间：
2016-01-19
影响因子：
2.4
通讯作者：
Rigby, S. P.
中科院分区：
文献类型：
--
作者：
Jin, C.;Langston, P. A.;Rigby, S. P.
我们提出了一个强有力的微观结构特征之间的关系，和流体速度场局限于，三维随机多孔材料。通过同时提取空间（欧拉）速度场的相关函数R-uu（r）和随机多孔非均质材料的微结构两点相关函数S-2（r）来揭示这种关系。这表明，有效的物理传输性能取决于复杂的孔隙结构的特点，由于R-uu（r）和S-2（r）之间的关系，在这项研究中揭示。此外，平均过剩图被用来调查的右尾的流向速度分量，发现服从轻尾分布。基于平均超额图，可以使用广义Pareto分布来近似正的流向速度分布。
We present a strong relationship between the microstructural characteristics of, and the fluid velocity fields confined to, three-dimensional random porous materials. The relationship is revealed through simultaneously extracting correlation functions R-uu (r) of the spatial (Eulerian) velocity fields and microstructural two-point correlation functions S-2(r) of the random porous heterogeneous materials. This demonstrates that the effective physical transport properties depend on the characteristics of complex pore structure owing to the relationship between R-uu (r) and S-2(r) revealed in this study. Further, the mean excess plot was used to investigate the right tail of the streamwise velocity component that was found to obey light-tail distributions. Based on the mean excess plot, a generalized Pareto distribution can be used to approximate the positive streamwise velocity distribution.