Hi all,
I am trying to do a DEM simulation with Polydisperse drag models in MFIX. I was wondering why polydisperse drag model are not available for DEM simulations! I tried BVK model with DEM in MFIX but I think the model does not consider the polydisperse correction in the calculations.
Thanks for your clarification and help.
Hi Salar. If you pull up the keyword help for ‘drag_type’ you will see that it says:
The extension _PCF following the specified drag model indicates that
the polydisperse correction factor is available. This option is available
for TFM solids only. For PCF details see:
• Van der Hoef MA, Beetstra R, Kuipers JAM.(2005)
Journal of Fluid Mechanics.528:233‑254.
• Beetstra, R., van der Hoef, M. A., Kuipers, J.A.M. (2007). AIChE Journal, 53:489‑501.
• Erratum (2007), AIChE Journal, Volume 53:3020
“Available for TFM solids only” means that the feature is only implemented in the TFM portion of the model, it is not implemented at all for DEM or PIC. You are free to modify the code to add this, if you know what correction you’d like to apply.
The BVK model is not one of the polydisperse models (no _PCF) so it is available for use in DEM models, as are several others.
– Charles