'This work evaluates the effectiveness of Two-Fluid Model (TFM) and CFD-Discrete Element Method (CFD-DEM) to simulate gas flows with dense particles by using a simplified Fluidized Bed as a test case.This document includes: (i)TFM simulations performed using two drag models, namely Gidaspow and Syamlal-O’Brien, using Ansys Fluent 18.0, corresponding to the experiments performed by Kuipers (1992) (ii)TFM and CFD-DEM simulations performed using Gidaspow’s drag model in OpenFOAM corresponding to the experiments performed by Goldschmidt (2004).'