DEM-LBM coupling for partially saturated granular assemblies

Younes, N.; Wautier, Antoine; Wan, Richard; Millet, Olivier; Nicot, François; Bouchard, R.

doi:10.1016/j.compgeo.2023.105677

Cited by 11 publications

(2 citation statements)

References 56 publications

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“…Unlike pendular bridges, the nonmonotonic F *– S * relationship of funicular bridges indicates that the cohesive effect is not optimal when three grains are in contact. Therefore, further macro research is essential to assess the mechanical properties of wet granular media, such as coupling LBM-DEM . By observation of numerical images, it becomes feasible to anticipate the location of rupture once the funicular bridge was stretched beyond a certain point.…”

Section: Discussionmentioning

confidence: 99%

Numerical Investigation of Funicular Liquid Bridges between Three Spherical Grains in a Bidisperse Particulate System

Wang,

et al. 2024

Langmuir

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Appropriate capillary effects are beneficial for controlling the wet powder performance and agglomerate formation. As water content rises, the funicular regime supplants the pendular regime as the predominant state in wet granular media. The displacement of grains leading to the stretching of funicular liquid bridges until rupture is an interesting and common phenomenon. Utilizing Surface Evolver software (an energy minimization approach), this work develops an efficient and accurate numerical model to describe liquid interactions among three spherical grains. The effects of liquid volume, contact angle, grain size ratio, grain-pair gap, and separation distance on the capillary forces and rupture distances are investigated. Notably, we present a modified closed-form equation for predicting the rupture distance of funicular bridges between three grains, which reflects the coupled effects of the contact angle, grain size, and liquid volume on rupture distance. This present study provides insights for incorporating capillary effects into mechanical models relying on microassembly composed of several grains in bidisperse particulate systems. Additionally, the numerical findings confirm some findings regarding the splitting of funicular bridges.

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Section: Discussionmentioning

confidence: 99%

Numerical Investigation of Funicular Liquid Bridges between Three Spherical Grains in a Bidisperse Particulate System

Wang,

et al. 2024

Langmuir

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“…In recent years, particle transport within fluid flows has found widespread applications in science and engineering domains [9]. Simulation methods involving fluid-particle coupling include lattice Boltzmann method (LBM)/discrete element method (DEM), discontinuous deformation analysis (DDA)/smoothed particle hydrodynamics (SPH), particle flow code (PFC)/computational fluid dynamics (CFD), DEM-CFD, and others [3,[10][11][12]. Among these approaches, the DEM-CFD approach holds particular appeal owing to its computational convenience [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Water and Mud Inrush Processes in Mountain Tunnels Using Coupled Lattice Boltzmann/Discrete Element Methods

Fan

2024

Applied Sciences

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Investigating the mechanism of sudden water inrush and mudflow in mountain tunnels is crucial for implementing preventive measures. Tunnel excavation through a fault or fractured zone can easily trigger sudden water inrush or mudflow. In this paper, the coupled lattice Boltzmann method (LBM) and discrete element method (DEM) were employed to reproduce the process of water and mud inrush in mountain tunnels. The failure of tunnel mud burst and water inrush involves a fluid–solid coupling process. A two-dimensional Boltzmann method for fluids and DEM for particles were utilized, with the coupled LBM-DEM boundary adopting the immersed moving boundary method. For simulating the water inrush process, a numerical model was established to replicate the flow of water particles within karst pipelines, featuring dimensions of 7 cm length, 4 cm width, and consisting of 100 particles. Particles are transported through water flow to the outlet of karst pipelines under hydraulic gradient loading. When the hydraulic gradient exceeds 6, the Darcy velocity gradually tends to be constant. As for simulating the mud inrush process, a numerical model was developed with dimensions of 5 cm length and 4 cm height, incorporating 720 randomly generated particles. The results demonstrated the successful reproduction of the evolution process encompassing three consecutive stages of tunnel mud-burst failure: initiation, acceleration, and stabilization. The occurrence of mud inrush disasters is attributed to combined action involving disaster-causing geotechnical materials, groundwater pressure, and tunnel excavation.

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Parameter optimization of phase-field-based LBM model for calculating capillary forces

Bouchard,

Younes,

Millet

et al. 2024

Computers and Geotechnics

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DEM-LBM coupling for partially saturated granular assemblies

Cited by 11 publications

References 56 publications

Numerical Investigation of Funicular Liquid Bridges between Three Spherical Grains in a Bidisperse Particulate System

Numerical Investigation of Funicular Liquid Bridges between Three Spherical Grains in a Bidisperse Particulate System

Numerical Simulation of Water and Mud Inrush Processes in Mountain Tunnels Using Coupled Lattice Boltzmann/Discrete Element Methods

Parameter optimization of phase-field-based LBM model for calculating capillary forces

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