Aravena A. auteur aut IRD Chupin L. auteur aut IRD Dubois T. auteur aut IRD Roche Olivier auteur aut IRD ECCOMAS : European Congress on Computational Methods in Applied Sciences and Engineering, 8., Oslo (NOR), 2022/06/05-09 text conferencePaper eng text/pdf reformatted digital access A model accounting for fluidisation by pore gas pressure in dense granular flows is presented. A viscoplastic rheology, based on the Drucker-Prager criterium, is used to describe the granular medium which is a mixture of air and glass beads. The pore gas pressure, which satisfies an advection-diffusion equation, reduces the friction between the particles and thus the value of the apparent viscosity. As a consequence, dense fluidised granular flows can travel longer distances. In laboratory experiments, the run-out distance reached by dense granular columns when collapsing is almost doubled when fluidisation is applied. This fundamental result, in the context of pyroclastic density currents, is reproduced by numerical simulations performed with the fluidised model. specialized 020MATH ECCOMAS : European Congress on Computational Methods in Applied Sciences and Engineering, 8., Oslo (NOR), 2022/06/05-09 12 multigr. Oslo [s.n.] 2022 https://www.documentation.ird.fr/hor/fdi:010085789 [F B010085789] https://www.documentation.ird.fr/hor/fdi:010085789 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2022-11/010085789.pdf IRD - Base Horizon / Pleins textes 2022-07-19 2022-11-09 fdi:010085789 fre