Influence of Particle Size Characteristics and Swelling of Solid Particles in Porous Media on Pore-Scale Flow Field Characteristics of Groundwater
Hou Yusong
Liu Su
Xin Hu
Wu Jichun
Hu Xiaonong
Xing Liting
Abstract：The study of groundwater pore-scale flow field characteristics is of great significance for the in-depth understanding of groundwater seepage and solute transport. However,the effect of the microstructure of porous media with different particle size characteristics on the pore-scale flow field is yet unclear. This paper constructs porous media with different particle size distribution characteristics and swelling degrees of solid particles using an iterative rearrangement algorithm. On this basis,the effects of the average particle size,particle size variance and solid particle swelling degrees on the characteristics of groundwater flow field are investigated. The results show that under the condition of the same porosity of the porous media,the mean particle size and particle size variance of solid grains have less influence on the flow field characteristics such as the heterogeneity and probability density distribution of flow velocity in porous media. However,in the same medium,when the expansion of solid particles causes a reduction in porosity,a smaller change in average particle size can have a significant effect on the above flow field characteristics. For example,when the expansion degree of solid particles increases,a slight increase in particle size will lead to a large rise in the proportion of the dominant flow area and the stagnant region at the same time,a significant enhancement in the heterogeneity of flow field,and a significant growth in the divergence degree of the flow velocity probability density distribution.
Keywords：groundwater flow field characteristicsporous mediasolid particle sizepore scalenumerical simulationhydrogeology
Publication Date：2024-07-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 2589-2599 )