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Modelling the normal bouncing dynamics of spheres in a viscous fluid

Izard, Edouard and Lacaze, Laurent and Bonometti, Thomas Modelling the normal bouncing dynamics of spheres in a viscous fluid. (2017) In: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media, 3 July 2017 - 7 July 2017 (Montpellier, France).

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Official URL: https://doi.org/10.1051/epjconf/201714009014

Abstract

Bouncing motions of spheres in a viscous fluid are numerically investigated by an immersed boundary method to resolve the fluid flow around solids which is combined to a discrete element method for the particles motion and contact resolution. Two well-known configurations of bouncing are considered: the normal bouncing of a sphere on a wall in a viscous fluid and a normal particle-particle bouncing in a fluid. Previous experiments have shown the effective restitution coefficient to be a function of a single parameter, namely the Stokes number which compares the inertia of the solid particle with the fluid viscous dissipation. The present simulations show a good agreement with experimental observations for the whole range of investigated parameters. However, a new definition of the coefficient of restitution presented here shows a dependence on the Stokes number as in previous works but, in addition, on the fluid to particle density ratio. It allows to identify the viscous, inertial and dry regimes as found in experiments of immersed granular avalanches of Courrech du Pont et al. Phys. Rev. Lett. 90, 044301 (2003), e.g. in a multi-particle configuration.

Item Type:Conference or Workshop Item (Paper)
Additional Information:This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Thanks to EDP Sciences editor. The original PDF of the conference can be found at https://www.epj-conferences.org/articles/epjconf/abs/2017/09/epjconf162025/epjconf162025.html
HAL Id:hal-01757874
Audience (journal):International peer-reviewed journal
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Other partners > Arcelor Mittal Research (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Thomas BONOMETTI
Deposited On:04 Apr 2018 07:59

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