Issue with VTK visualization

MFiX
1

Hello,

This simulation is working. It has progressed to 0.224s, but the VTK file is only going up to 0.01s. I am attaching the zipped file with everything. Kindly have a look. Even when the simulation is gone up to 0.49s, the VTK file is showing upto 0.28s. KIndly let me know what is the problem with the visualization. Why is it now showing the entire time duration ?

I look forward to hearing from you.

Thanks and Best Regards,

Sincerely,

Debashis

Screenshot-1
Screenshot-12379×1266 218 KB

Screenshot
Screenshot919×1269 144 KB

syam100kfix_2026-07-14T140500.775832.zip (68.4 MB)

Main menu/Submit bug report - attach zip file here.

2

Are you actually able to run this simulation? The mesh is too coarse to resolve the geometrty:

image
image432×845 152 KB

From the log files you sent, you have lost 85% of the particles at time=0.22s. If a vtp file has zero particles in it (full domain or any sub domains) you defined, the vtp file will not be written. You would get a message like this:

  WRITING VTP FILE : PARTICLES_FUNNEL_BODY_0000.vtp .
.....
 VTP file not written (zero particles in vtk region).

(Go to output>Residuals and check “Display residuals” for a more verbose output).

3

Dr. Dietiker,

Yes, this simulation ran. It had 30x90x30 grid and 100K particles with 100micrcon diameter. Attached are some movie files. This simulation used earth gravity, atmospheric pressure etc.

The next aim in this work is to begin testing whether the funnel/collector geometry can capture ice particles representative of an Enceladus plume. It will involve rarefied gas flow and interaction between the rarefied gas and ice particles from Enceladus plume.

Kindly let me know if MFiX-DEM can be applied to this problem involving rarefied gas flow.

Should I include a pressure boundary condition at inlet or a mass flow boundary condition at inlet ?

single_stl_combined_y_vertical_100K_SYAM_STUCK_STATS_FIXED.mfx (34.7 KB)

I am referring to the paper On understanding the physics of the Enceladus south polar plume via numerical simulation - ScienceDirect

I look forward to hearing from you.

Thanks and Best Regards,

Sincerely,

Debashis

4

Dr. Dietiker,

Any answer to this ? Can MFiX be applied for rarefied gas-particle flows ?

Best Regards,

Debashis