Numerical analysis of the drag on a rigid body in an immersed granular flow
| Autor: | Jonathan Lambrechts, Nathan Coppin, Frédéric Dubois, Matthieu Constant, Vincent Legat |
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| Přispěvatelé: | Institute of Mechanics, Materials and Civil Engineering [Louvain] (IMMC), Université Catholique de Louvain = Catholic University of Louvain (UCL), Expérimentation & Calcul Scientifique (COMPEX), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), UCL - SST/IMMC/MEMA - Applied mechanics and mathematics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Dilatant
Materials science Flow (psychology) Computational Mechanics Granular drag [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph] 01 natural sciences 010305 fluids & plasmas [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Stress (mechanics) Physics::Fluid Dynamics symbols.namesake Modelling and Simulation 0103 physical sciences Froude number Nonsmooth contact dynamics Unresolved model Cylinder MigFlow 010306 general physics Civil and Structural Engineering Fluid Flow and Transfer Processes Numerical Analysis Janssen effect Mechanics Rigid body Stress field Computational Mathematics Drag Modeling and Simulation symbols |
| Zdroj: | Computational Particle Mechanics Computational Particle Mechanics, Springer Verlag, 2021, ⟨10.1007/s40571-021-00418-w⟩ Computational Particle Mechanics, Vol. 9, p. 393-406 (2022) |
| ISSN: | 2196-4378 2196-4386 |
| Popis: | International audience; The drag exerted on an object moving in a granular medium is subject to many studies: in dry grains, it depends on the stress – often due to gravity – inside the grains. For Froude numbers less than 10, the drag is independent of the velocity. In immersed grains, it is proportional to the apparent weight of the grains and it depends on both velocity and fluid viscosity. In this paper, the drag on a cylinder in dry and immersed granular flow is simulated with a multi-scale FEM-DEM model. The Janssen stress saturation effect before the flow and velocity independence of the drag are both reproduced. The semi-circular orientation of the stress field supports the hypothesis of a spherical zone of influence of the cylinder. This orientation does not significantly change upon flowing. The results show the velocity independence of the drag is due to particle friction. In the immersed case, the fluid contribution is negligible on its own. A dimensional analysis suggests that shear thickening should be taken into account. The transition between the quasi-static and the fluidized regime is accompanied by a decrease of the stress field downstream of the cylinder and a change in the shape of the shear zone. |
| Databáze: | OpenAIRE |
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