How to output the particle positions during the simulation

[cgw]

Hi BK, welcome to the MFiX forum.

You are correct that particle position is currently not one of the options in “Output” or “Monitors”. We may add this to a future release, since this question comes up from time to time.

It’s always good to search the forum before posting. Searching for “particle position” find this thread:

Saving data as .csv files

I have run a DEM model in mfix and now want to save the particle data for each time step. I have seen that I can do this through importing the .pvd file into paraview and see the spreadsheet of data. However, I want to save all the velocity/coordinates of each particle for each time step. I see I have a series of .vtp files containing this information. Do i have to individually put these into paraview and save the data, or is there a way to save all the data at once?

which explains how to get particle positions from VTP files, as well as this thread:

Best practices for implementing your own monitors?

Hey all, I’d like to add a monitor for average particle-wall separation distance (to help quantify sticking behavior), and it doesn’t look like the GUI has an option for tracking particle positions, as you can see below. I should be able to do this in usr2_des, but it would be really nice to have my particle velocity and particle position readouts synced up. I’m going through the monitor code now and there is a lot going on, so I’m having trouble identifying where/how I could append the particl…

which discusses how to do this using a UDF approach.

If you have any further questions after reading these, you can follow up here.

Hope this helps,

– Charles