| Autor: |
Richard, Patrick, Artoni, Riccardo, Valance, Alexandre, Delannay, Renaud |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Granular Matter, Springer Verlag, 2020, 22 (4) |
| Druh dokumentu: |
Working Paper |
| Popis: |
The properties of confined granular flows are studied through discrete numerical simulations. Two types of flows with different boundaries are compared: (i) gravity-driven flows topped with a free surface and over a base where erosion balances accretion (ii) shear-driven flows with a constant pressure applied at their top and a bumpy bottom moving at constant velocity. In both cases we observe shear localization over or/and under a creep zone. We show that, although the different boundaries induce different flow properties (e.g. shear localization of transverse velocity profiles), the two types of flow share common properties like (i) a power law relation between the granular temperature and the shear rate (whose exponent varies from 1 for dense flows to 2 for dilute flows) and (ii) a weakening of friction at the sidewalls which gradually decreases with the depth within the flow. |
| Databáze: |
arXiv |
| Externí odkaz: |
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