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Article Dans Une Revue Engineering Geology Année : 2024

Hydro-mechanical analysis of particle migration in fractures with CFD-DEM

Résumé

Particle migration driven by fluid flow is presented in many geological and geotechnical contexts, such as sand production in oil exploitation, internal erosion in dikes or dams, and proppant movement in petroleum engineering. In this study, fluid flow-induced particle migration in rock fractures has been investigated by coupling the computational fluid dynamics (CFD) and the discrete element method (DEM), focusing on the particle movements and the associated migration mechanisms. To fit the fracture roughness, tetrahedral grids were used to generate the fluid mesh in CFD analysis. The CFD-DEM model was first calibrated against experimental and analytical results, then a series of simulations was conducted to analyze the effects of fracture roughness (defined by the joint roughness coefficient, JRC), size ratio between fracture aperture and particle diameter, and hydraulic gradient on the migration of particle assemblies. Three modes of particle movement were obtained, i.e., the movement of particle assemblies as a whole, the separation of large particle assemblies into smaller ones, and the detachment of particles at assembly boundaries. Additionally, the velocity of a particle assembly passing through the fracture was negatively related to the aggregation of particles while positively related to the erosion rate of particle assemblies within the fracture. An equation to calculate the time of a particle assembly to pass through a fracture was proposed.
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Dates et versions

hal-04614174 , version 1 (17-06-2024)

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Tuo Wang, Pei Wang, Zhen-Yu Yin, Farid Laouafa, Pierre-Yves Hicher. Hydro-mechanical analysis of particle migration in fractures with CFD-DEM. Engineering Geology, 2024, 335, pp.107557. ⟨10.1016/j.enggeo.2024.107557⟩. ⟨hal-04614174⟩
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