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Accueil > Actualités > Événements > Événements 2024

Julien Chauchat à la conférence EFDC1 à Aix-la-Chappelle

Du 16 au 20 septembre, la conférence EFDC1 (1st European Fluid Dynamics Conference) a réuni 1200 personnes à Aix La Chapelle.

Résultant de la fusion de European Fluid Mechanics Conference et European Turbulence Conference, l’EFDC1 est un évènement majeur de la communauté des mécaniciens des fluides.

 Julien Chauchat a donné une conférence plénière intitulée « A multiphase flow vision of sediment transport : what can we learn from fluid mechanics ? » lors de cet évènement.

Abstract

Sediment transport controls the morphological process in rivers, estuaries and coastal oceans. It is by nature a two-phase problem involving fluid-particle and particle-particle interactions covering the full range of particle concentration. At high concentration, transport is dominated by particle-particle interactions (collisions, enduring contacts) and at lower concentration, the transport becomes increasingly dominated by turbulent eddies, while those can also be affected in return by the presence of particles. In order to tackle the multiscale nature of particulate flows in geophysics, continuum modeling is a key approach. In this presentation, I will report on the development of a collaboraive and an open-source two-phase flow modeling framework based on openFOAM and YADE, to elucidate some of the closure issues in the upscaling process. In this presentation, I will report on the development of an open-source two-phase flow modeling framework based on openFOAM and YADE, to elucidate some of the closure issues in the upscaling process. The continuum model, sedFOAM, integrates both the dense granular flow rheology and the kinetic theory of granular flows for the particle-particle interactions modeling as well as RANS and Large Eddy Simulation (LES) apporaches for fluid turbulence modeling. The model has been applied to numerous configurations ranging from fluid bed shear stress driven transport, the so-called bed-load transport, to gravity-driven flows such as underwater avalanches and granular collapse. These applications illustrate how the continuum modeling can contribute to improve our understanding of sediment transport processes and how it opens new perspectives to address unresolved science questions in this field.