Numerical modelling of foam Couette flows
Résumé
In this paper, a numerical simulation based on a tensorial elastoviscoplastic model is compared to experimental measurements on liquid foams for a bidimensional Couette flow, both in stationary and transient cases. The main features of of the model are elasticity up to a plastic yield stress and viscoelasticity above. The numerical modelling bases on a small set of standard material parameters that could be fully characterised. Shear localisation as well as fine transient observations are reproduced and are found to be in good agreement with experimental measurements. The effect of the friction of plates is taken into account. The plasticity appears to be the fundamental mechanism of the localisation of the flow. Finally, the present approach could be extended from liquid foams to similar materials such as emulsions, colloids or wet granular materials, that exhibits localisations.
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