Item: Discrete element modelling to compute drag coefficients of obstacles impacted by granular flows
Title: Discrete element modelling to compute drag coefficients of obstacles impacted by granular flows
Proceedings: International Snow Science Workshop, Davos 2009, Proceedings
Authors: Lionel FAVIER, Dominique DAUDON1, Frederic DONZE, Jacky MAZARS 3SR- Université de Grenoble - France
Abstract: Passive protection structures against natural granular flows (snow avalanches, debris flow) are designed with a rough approximation of their drag coefficient. The purpose of this research is thus to propose numerical tools, based on the discrete element method (DEM), that are able to offer possibilities that include: replicating inner flow properties, overcoming experimental limitations, and calculating the "real" drag coefficient of a granular flow. This numerical model will be validated by means of a laboratory experiment on a free surface glass bead flow impacting a small obstacle. After characterising the zone of obstacle influence and performing a time calculation optimisation, largescale parametric studies will be presented. Both numerical and physical parameters, such as obstacle geometry and the Froude number, will be explored herein. Lastly, an inter-grain cohesion law will be implemented and its influence on the zone of influence discussed.
Keywords: granular flow, discrete element, obstacle, drag coefficient
Digital Abstract Not Available