Hi, I am new to MFIX software. I am doing a DEM 2D simulation for binary particles in a fluidized bed. For mono particle simulation, it is running fine, but I am facing this problem for a binary particle with the same mesh size.
"INFO open_files.f:374
The following mesh file was not found: TRIAL2.msh
Mesh generation will be performed and a mesh file will be saved."
That message is an INFO message which does not indicate an error. Messages from the MFiX solver are 3 types, INFO, WARNING and ERROR. The INFO messages are just informational. What happens after this, does the simulation continue? Are there WARNING or ERROR messages?
Priyabata - please attach your input files. You can use the “Submit bug report” menu item (from the main menu) to create a .ZIP file containing all the MFiX inputs. Upload that to this page and I’ll take a look.
Thank you, Charles, for your quick reply.
With some modifications, I have tried to run the simulation. But after some iteration, it’s getting stopped. The error showing is:
ERROR time_step.f:193
DT < DT_MIN. Recovery not possible!
I have tried to change the time step maximum and minimum time step value, but same error is appearing. As per your suggestion here I have attached my file.
Kindly have a look and tell me where I am going wrong.
I usually find that simulations converge better with ideal gas law. Go to the fluid pane and set the density to “Ideal Gas Law”, and for Mol. Weight, use a constant value of 29 kg/kmol. The first P0 residual is very low (~1E-8), so set the fluid normalization (in the Numerics pane) to 0. Start with a time step of 1E-4 s and it should move forward.
Please verify your initial particle setup, you are asking for 25000 particles in each region, which is more than can fit.