Particle-scale studies elucidating visco-collisional rheology in granular-fluid flows
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912604121726976 |
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| author | Man, Teng Huppert, Herbert Feng, Qingfeng Hill, Kimberly |
| author_facet | Man, Teng Huppert, Herbert Feng, Qingfeng Hill, Kimberly |
| contents | We study the particle-scale dynamics that give rise to bulk flow behaviours of highly concentrated particle-fluid mixtures using discrete element method (DEM) simulations. We utilize boundary conditions of a stress-controlled shear cell and vary material properties and applied stresses systematically. We find the bulk rheology transitions smoothly among what might be called viscous, collisional, and visco-collisional behaviours based on average shear rate dependence as well as dominance of local interaction. Using specific measures of particle-scale dynamics, we find that the transitions in system rheologies coincide with statistically significant changes in the ``fabric'' (i.e., strong force network and coordination numbers), the ``granular temperature'' (i.e., fluctuation energy) and relative importance of fluid and interparticle contacts. Armed with these measures and previous theoretical work, we provide a foundation for understanding the particle-scale physics that gives rise to meso-scale rheologies and transitions from one to the next. We determine physics-based formulations to better represent dynamic behaviors for a wide range of material properties and loading conditions. Our study broadens the applicability of rheological models to natural and engineered systems by providing a foundation for a more general constitutive model. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_20700 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Particle-scale studies elucidating visco-collisional rheology in granular-fluid flows Man, Teng Huppert, Herbert Feng, Qingfeng Hill, Kimberly Soft Condensed Matter Disordered Systems and Neural Networks We study the particle-scale dynamics that give rise to bulk flow behaviours of highly concentrated particle-fluid mixtures using discrete element method (DEM) simulations. We utilize boundary conditions of a stress-controlled shear cell and vary material properties and applied stresses systematically. We find the bulk rheology transitions smoothly among what might be called viscous, collisional, and visco-collisional behaviours based on average shear rate dependence as well as dominance of local interaction. Using specific measures of particle-scale dynamics, we find that the transitions in system rheologies coincide with statistically significant changes in the ``fabric'' (i.e., strong force network and coordination numbers), the ``granular temperature'' (i.e., fluctuation energy) and relative importance of fluid and interparticle contacts. Armed with these measures and previous theoretical work, we provide a foundation for understanding the particle-scale physics that gives rise to meso-scale rheologies and transitions from one to the next. We determine physics-based formulations to better represent dynamic behaviors for a wide range of material properties and loading conditions. Our study broadens the applicability of rheological models to natural and engineered systems by providing a foundation for a more general constitutive model. |
| title | Particle-scale studies elucidating visco-collisional rheology in granular-fluid flows |
| topic | Soft Condensed Matter Disordered Systems and Neural Networks |
| url | https://arxiv.org/abs/2509.20700 |