Study of the Factors Influencing Diffusive Tortuosity Based on Pore-Scale SPH Simulation of Granular Soil
Study of the Factors Influencing Diffusive Tortuosity Based on Pore-Scale SPH Simulation of Granular Soil
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基于颗粒土孔隙尺度SPH模拟的扩散曲折度影响因素研究
DOI：
10.1007/s11242-020-01394-0
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发表时间：
2020-02
影响因子：
2.7
通讯作者：
Bing Bai
中科院分区：
文献类型：
--
作者：
Dengyu Rao;Bing Bai
扭曲度定量地反映了多孔介质的复杂性。对于多孔介质中的扩散过程，扩散扭曲不可避免地成为一个重要的研究课题。提出了一种基于光滑颗粒流体力学（SPH）三维孔隙尺度模拟研究颗粒土扩散扭曲的模拟实验方法。在模拟结果的基础上，讨论了扩散弯曲度与微结构参数之间的关系。对由PFC软件生成的三维颗粒土柱和由土柱周期性膨胀形成的土层进行了模拟实验。用纯水柱的解析解验证了孔尺度SPH扩散模型的准确性。结果表明，尺寸对扩散弯曲度有一定的影响。在扩散特性方面，二维剖面不能代表原始的三维介质。在土体压缩过程中孔隙度变化的有限范围内，孔隙度与扩散扭曲度之间的关系可以认为是线性的。此外，在颗粒尺寸均匀的情况下，扩散弯曲度与比表面积几乎成线性关系。土柱的弯曲度值大于土层的弯曲度值，说明对于厘米尺度土柱，侧壁对扩散的影响不容忽视。
Tortuosity quantitatively reflects the complexity of porous media. For the diffusion process in porous media, diffusive tortuosity is inevitably an important research topic. A simulation experimental method is proposed to study diffusive tortuosity in granular soil based on 3D pore-scale simulation by smoothed particle hydrodynamics (SPH). On the basis of the simulation results, the relationships between diffusive tortuosity and microstructural parameters are discussed. Simulation experiments are implemented on 3D granular soil columns generated by PFC software and soil layers formed by periodic expansion of the soil columns. The accuracy of the pore-scale SPH diffusion model is verified by the analytic solution for the particular case of a pure water column. The results show that the dimensionality does affect the diffusive tortuosity. 2D profiles cannot represent the original 3D medium in terms of the diffusion characteristics. Within the limited range of the variation of porosity during soil compression, the relationship between porosity and diffusive tortuosity can be considered to be linear. In addition, for the case of uniform granule size, diffusive tortuosity is almost linearly related to the specific surface area. Tortuosity values for soil columns are larger than those for the soil layer, which denotes that the effect of the sidewall on diffusion cannot be overlooked for a centimeter-scale soil column.
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影响因子：
2.7
作者：
S. M. R. Niya;A. Selvadurai
通讯作者：
S. M. R. Niya;A. Selvadurai
用于分析具有不连续界面的均匀介质中的热过程的 SPH-FDM 边界
DOI：
10.1016/j.ijheatmasstransfer.2017.10.004
发表时间：
2018
影响因子：
5.2
作者：
Bing Bai;Dengyu Rao;Tao Xu;Peipei Chen
通讯作者：
Peipei Chen
影响因子：
64.8
作者：
L. Rosenhead
通讯作者：
L. Rosenhead
影响因子：
2.7
作者：
F. Valdés-Parada;M. L. Porter;B. Wood
通讯作者：
F. Valdés-Parada;M. L. Porter;B. Wood
影响因子：
4.7
作者：
AKANNI, KA;EVANS, JW
通讯作者：
EVANS, JW