Modélisation diphasique de la dispersion turbulente dans le transport en suspension de particules sédimentaires

The numerical modelling of sediment transport is achieved by an Eulerian two-phase flow approach. We focus our attention on the dispersion of non-cohesion sediments particles, typically sands, in suspension. Based on literature of two-phase flow modelling, we introduce a first-order model for turbulent kinetic energy of the solid phase and the fluid-particle velocity covariance based on the kinetic theory of granular flows (Model ks i kfs). This model give an estimate of the fluid-particle velocity covariance tensor and thus allows us to close the model of turbulent dispersion for particles. The comparison with experiments shows that the model qualitatively reproduced the features of the flow, especially the existence of a velocity lag between fluid and particles.