Numerical study of water–air distribution in unsaturated soil by using lattice Boltzmann method

Xu, Fei; Liang, Shuang; Zhang, Yaning; Li, Bingxi; Hu, Yiran

doi:10.1016/j.camwa.2019.08.013

Cited by 7 publications

(2 citation statements)

References 38 publications

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“…To describe the porous media structure with complexity and disorder, a stochastic growth method (Xu et al , 2021) was introduced to form porous structures in this paper. As shown in Figure 1, the porous structure begins to grow from randomly distributed growth cores in several random directions i , initially forming particle units of various shapes.…”

Section: Numerical Modelmentioning

confidence: 99%

Simulation of phase change during the freezing of unsaturated porous media by using a coupled lattice Boltzmann model

Xu,

Wang,

et al. 2024

HFF

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Purpose The purpose of this paper is to develop a coupled lattice Boltzmann model for the simulation of the freezing process in unsaturated porous media. Design/methodology/approach In the developed model, the porous structure with complexity and disorder was generated by using a stochastic growth method, and then the Shan-Chen multiphase model and enthalpy-based phase change model were coupled by introducing a freezing interface force to describe the variation of phase interface. The pore size of porous media in freezing process was considered as an influential factor to phase transition temperature, and the variation of the interfacial force formed with phase change on the interface was described. Findings The larger porosity (0.2 and 0.8) will enlarge the unfrozen area from 42 mm to 70 mm, and the rest space of porous medium was occupied by the solid particles. The larger specific surface area (0.168 and 0.315) has a more fluctuated volume fraction distribution. Originality/value The concept of interfacial force was first introduced in the solid–liquid phase transition to describe the freezing process of frozen soil, enabling the formulation of a distribution equation based on enthalpy to depict the changes in the water film. The increased interfacial force serves to diminish ice formation and effectively absorb air during the freezing process. A greater surface area enhances the ability to counteract liquid migration.

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Section: Numerical Modelmentioning

confidence: 99%

Simulation of phase change during the freezing of unsaturated porous media by using a coupled lattice Boltzmann model

Xu,

Wang,

et al. 2024

HFF

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“…Therefore, to understand the hydro-mechanical behaviours of unsaturated soils from soil particle interactions as well as pore-scale liquid-air interactions is crucial for macro-scale theory development and validations. In the past two decades, numerical approaches are employed to study the micro-scale behaviours of partially saturated granular soils, including the discrete element method (DEM) [11,34,[42][43][44], level set method [37] and the lattice Boltzmann method (LBM) [30,31,46]. However, these numerical methods have different drawbacks to study unsaturated soil behaviours.…”

Section: Introductionmentioning

confidence: 99%

A micro-investigation of unsaturated sand in mini-triaxial compression based on micro-CT image analysis

et al. 2022

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The mechanical behaviours of unsaturated soils are highly related to the water content and pore water and air distributions. Under the context of climate change, geo-disasters related to soil moisture change attract more and more research attentions. Due to the heterogeneity of soil textures and the complicated morphology of liquid phases, it is crucial to understand the microstructural features of unsaturated soils. This work presents a study based on a miniaturized suction controlled triaxial device which is suitable for micro-CT image analysis. A fine sand is sheared in this device under different suction levels while CT scans are taken at different strain stages. After image 3D reconstruction, image trinarization, label analysis, contact detection and other customized image analysis and calculations, the micro-mechanisms of unsaturated granular soils upon triaxial shearing are investigated. It is observed that the inter-particle contact coordination number is reduced after shearing due to the dilation behaviour and the sample with the highest capillary strength has the highest coordination number. Although there is an initial fabric anisotropy due to gravity and sample compaction, triaxial loading will further enlarge the fabric anisotropy of the solid phase and the solid fabric anisotropy is also associated with shear strength. With the development of shear band, water drains out and the quantity of small-volume liquid clusters in the liquid bridge increases. This shifts the distributions of inter-facial areas. The effective stress tensor is interpreted microscopically based on small RVEs. Based on the CT image analysis, the suction-induced stress component is not an isotropic term and the anisotropy of the water phase is increased with triaxial deformation as well as decrease in degree of saturation when there are more isolated water bridges formed around solid contacts.

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A novel lattice model to predict chloride diffusion coefficient of unsaturated cementitious materials based on multi-typed pore structure characteristics

Tong,

Xiong,

Zhang

et al. 2024

Cement and Concrete Research

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Numerical study of water–air distribution in unsaturated soil by using lattice Boltzmann method

Cited by 7 publications

References 38 publications

Simulation of phase change during the freezing of unsaturated porous media by using a coupled lattice Boltzmann model

Simulation of phase change during the freezing of unsaturated porous media by using a coupled lattice Boltzmann model

A micro-investigation of unsaturated sand in mini-triaxial compression based on micro-CT image analysis

A novel lattice model to predict chloride diffusion coefficient of unsaturated cementitious materials based on multi-typed pore structure characteristics

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