Negative Gas Density Detected

MFiX
#1

I am getting the subject error in MFIX 19.1 where ultimately the time step is driven down to be not recoverable. Any suggestions on how I can resolve this problem?

#2

fuel_reactor2db.mfx (29.9 KB)
I have uploaded the mfx file I am trying to run

#3

Here is the user_rates.
usr_rates.f (12.2 KB)

#4

Dear mkdenson, have you solve this issues?