Error time_step 195

MFiX
#1

I got the error time_step 195 problem. I put several plates in the domain region and they act as a reflector of particles.
plates.zip (98.7 KB)

#2

You probably saw this message as well: DT < DT_MIN. Recovery not possible! Which means that your simulation is not converging. Make sure your ICs and BCs make physical sense.

#3

I tried running your setup but the right.stlwas missing from the zip file. Ignoring that issue, I ran it and the fluid mesh is failing:

image
image471×534 8.75 KB

You probably need a finer fluid mesh and play with the cutcell tolerences to get a good fluid mesh. Then hopefully the solver will converge and you will not get the:

WARNING leq_bicgs.f:269
Warning: Singular matrix detected when solving for : Pp_g

messages. Do you need to solve the fluid?

#4

Thanks for the reply. I solved this problem by increasing the plate thickness from 2 mm to 5 mm (because the mesh is 5mm*5mm) and make the thickness direction little smaller than the rectangular column. This step is important to get the fluid domain although the STL file normally should be larger than the geometry in many cases. I do not know why but it works in this case. Thank you for your work.