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Rhéologie des suspensions non-browniennes : modèle de contact lubrifié et simulations par éléments discrets

Abstract : Flow properties (i.e. rheology) of suspensions depend upon constituent phases and interactions between them. For this kind of materials, stress has multiple origins: contact between particles, fluid flow and fluid-particles interactions.In this work, a new lubricated contact model has been developed and validated on several 2-particles test cases.This model regularizes singularity at contact, and takes care of very small gaps between particles. The numerical scheme developed ensure unconditional stability on time integration.Especially, this model is able to simulate two perfectly smooth particles.This model has been introduced into a DEM formulation and used to simulate simple shear experiments on suspensions. Flow behaviours agrees account quantitatively for available experimental data. The role of contacts between particles and of the friction coefficient have been extensively studied. It leads to a new model for the suspension rheology and for the jamming volume fraction. The model has also been used to study viscous resuspension, which enables the determination of the normal components of the particle stress.
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  • HAL Id : tel-02888343, version 1

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William Chèvremont. Rhéologie des suspensions non-browniennes : modèle de contact lubrifié et simulations par éléments discrets. Mécanique des fluides [physics.class-ph]. Université Grenoble Alpes [2020-..], 2020. Français. ⟨NNT : 2020GRALI009⟩. ⟨tel-02888343⟩

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