Mass flow rate in obstructive pattern

MFiX
#1

invertedvobstruction_2023-10-19T173417.842086.zip (873.3 KB)

Ive been trying to run a simple massflow rate calculation on this pattern
the program runs and then stops. theres no explanation if there is an error.
it just wont simulate.
how do i proceed with this?
is the issue with the stl ?

#2

First, you should consider whether you can run such DEM simulation on your computer. This has around 12 million particles. This will likely won’t run on a single core.
There are a few issues with the setup:

  1. The STL normals are pointing in the wrong direction.
  2. The DES grid defaults to a size that is 3 times the particle diameter, which is in the order of 1mm. With a domain of about 8mx9mx3m, this becomes overwhelming. You should overwrite the default values so it becomes manageable (Solids>DEM> Search grid partition).
  3. In the IC pane, do not use “Fit particles to region”, this is broken. Instead, use the settings in “Show DEM seeding options” to get a better control of particle spacing.