I would like to point out a difficulty I am encountering in a TFM-DEM Hybrid usin MFIX 20.1.2. I am trying to run the legacy_test cases and they run in the background with no problem for large values of TSTOP. However, when I try to run them in MFiX GUI, they fail for times above the 0.1 s limit in the test.
I believe there shall be a problem in the units conversion, because when I manually change the units from CGS to SI and run the test, I am encountering a similar issue.
On the other hand, I am running a test case in which I have a small amount of DEM particles interacting with the dense TFM phase. I have two cases: one without particles (purely TFM) and a hybrid TFM-DEM in which the particles are fixed around 40 cm above the bed through user-defined functions (the bed is 50 cm height). I am observing a different behavior of the dense phase in these two cases, which makes me wonder about the most appropiate/recommended drag or friction conditions for the hybrid modeling. Please see attached a .dat file of this last test, in case I am doing something wrong. mfix.mfx (10.4 KB)
Thank you very much for your help.