Error from time_step.f:196 DT < DT_MIN. Recovery not possible!

MFiX
#1

Hi developers, I had a problem running the DEM model as shown in the image below. Particle positions for simulating initial conditions are read in the “particle_input.dat” file, and the initial total number of particles is 54620. The volume fraction of the inlet gas is 0.8, and the volume fraction of the two particles is 0.16 and 0.04 respectively. When the flow rate of the inlet is set to 1.6 or lower, the error shown in the following figure will be found.

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I have tried to divide a finer grid, but the error shown in the following figure occurs again. I think the volume fraction of my imported particles is already very low, and the method of dividing the grid is not feasible. How can I solve the problem of running divergence?
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Here is my running case：
U_0.3_1150C_0.2_1.6.zip (46.5 MB)

#2

Does the simulation run if you turn off reactions? I see you have many fortran files in the project directory. I have not looked at them, but does it run better with the original files?