Lagrangian simulations of dense systems of particles are performed for various solid volumetric fraction in order to study the influence, through an idealised drag force, of an interstitial gas. Numerical measures of kinetic and collisional stress are extracted from simulations and compared with theoretical values obtained by an Eulerian model. They show a good agreement with the prediction of drag influence, in particular some dramatic change of the granular temperature is both measured and predicted.
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