Anyone can save my fluidized bed sumulation

Recently, I encountered a problem when simulating a fluidized bed with temperature convection. The expermental setups are strictly set according to the paper (See Exp.pdf), where powder diameter is 1mm, with 57296 sand particles in a 0.08m*0.015m*0.25m chamber, the CFD mesh is mad according to the published paper as well, which is 32*6*100. I chose model type A and Gidaspow drag force model and the solver cfdemSolverPisoScalar. However, the powder bed cannot be fluidized even the inlet gas velocity (1.2m/s) has already exceeded the fludized velocity. I do not understand why this problem occurs and it really frustrated me. It seems that the gas flux at inlet is not actually transported through the powder bed. It is really really great if anyone can help me solve this problem. Attached please find the paper and the CFD-DEM zipped files.