Journées autour des écoulements granulaires

Session

Lundi après-midi

3 juil. 2023, 14:00

Amphi Hennequin (Campus des Cézeaux - Aubière)

86. Crossing approaches to better understand (and model) bedload transport and granular media

Raphael Maurin

03/07/2023 14:00

Présentation orale

Présentation

Bedload transport can be seen as an interaction between a granular medium and a fluid flow. This perspective and the associated modelling can benefit to both field, by on one hand considering a granular media approach to better understand and model bedload transport, and on the other hand challenging classical granular media description analyzing the complex bedload transport...

92. Numerical analysis at the particle scale of granular flow hysteresis on an inclined plane

Clovis Lambert

03/07/2023 14:50

Présentation orale

Présentation

Granular media are ubiquitous in environmental processes and geophysical phenomenon such as sediment transport, landslides or avalanches. Granular media can be classified into three different regime : solid (quasi-static), liquid (dense flow) and gas (dilute flow). The transition between the motionless solid state and the dense flow state corresponding to the initiation of motion is an...

93. Grain size segregation in bedload sediment transport

Philippe Frey (UGA, INRAE, ETNA, IGE, Grenoble)

03/07/2023 16:00

Présentation

Bedload, the coarser material transported in contact with the bed by turbulent flow in stream channels, has major consequences for public safety, water resources, and environmental sustainability. Size sorting also named size segregation is responsible for our limited ability to predict sediment flux and river morphology, especially in mountains where steep slopes drive an intense transport of...

88. A well-balanced entropy scheme for a shallow water type system describing two-phase debris flows

Elias Drach (Université Gustave Eiffel)

03/07/2023 16:50

Présentation orale

Présentation

In the context of modeling two-phase debris flows involving grains and fluid, some shallow water systems arise with internal variables.
Our work focus on such a shallow water system with two internal variables and a topography $b$ which adds a nonconservative term. \

For numerical purposes, it is desirable to deal with a system where the mathematical entropy (the physical energy of...