Same MFiX input file in same version of MFiX but slightly different results shown in output files (*.vtp)

MFiX
1

Dear whom it may concern:

I am working on MFiX 24.1.1 and using CGP=3 for my simulation as shown below:
solids_model(1) = ‘CGP’
cgp_stat_wt(1) = 3.0

I noticed that every time I run the simulation, the results are slightly different. Is this expected behavior in MFiX due to randomized initialization? If so, is there a flag I can set in the MFiX input deck (*.mfx) to ensure the simulation results are always exactly the same?

I appreciate your support.

Sincerely yours,

2

We added a REPEATABLE flag (default TRUE) to force the random number generator to seed with a fixed value. But this feature is not present in MFIX 24.1.1

If you upgrade to 25.1.2 or newer, this flag will be available. Note that there is an issue with 25.2 on Windows, we will be issuing a bugfix release today or tomorrow. If you are not using Windows it is not a problem and if you are, there is a workaround (see Problem running MFiX 25.2 on Windows - #5 by edcanop )

Please let us know if this works for you.

– Charles

3

Dear Charles:

I deeply appreciate your fast response on my question. Have a wonderful Wednesday!

Junyung

Sincerely yours,