How to create file containing impact position of particles against a part with EDEM?
Answers
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Hi,
In EDEM it's important to note the difference between Contacts and Collisions. A Contact is the instantaneous connection between particle-particle or particle-geometry and from the Contact you get the position, force, overlap and all other data associated with this Contact.
A Collision is a time-dependent connection between two elements, typically the Collision will start when two elements first become in Contact and this will result in a low force with small overlap. The force associated with the Collision will change over time until the elements are no longer in Contact and the Collision ends. 1 Collision is essentially comprised of multiple Contacts.
When you save EDEM data you choose a save frequency, by default Collisions are not saved and EDEM will record Contact information at the point at which the save occurs. If for example your save frequency is 0.1 s and at time 0.11 s a Contact occurs then this won't be recorded, only the Contacts occurring at the save time-step are recorded.
You can turn on Collisions in the EDEM Simulator option (there is a Track Collisions Tick Box, this is only supported for CPU processing not GPU). All collision data is saved if you choose this option, if for example your contact/collision starts at 0.11 s and ends at 0.15 s all the collision data will be saved to the file at the next save point (0.2 s given the example above).
If you go to the EDEM Analyst > File > Export > Results Data and if you create a new Query you have the option to choose Contact or Collision (if you have chosen to save this) available. Contact gives you the option to export the contact position to a file and collision also gives the option to export Relative Velocity which isn’t available via Contacts. In ‘General’ you can set the time or time-period to export from and in Queries you can choose Type 1 (particle) and Type 2 (Geometry name) to export the data for, along with Querty Type. Query type ‘Standard’ gives you a value per Collision or Contact per save point. Average/Max/Min/Total under query type is the average, max, min or sum of the Standard values.
Just to note the EDEM Training sessions include EDEM Analyst training - https://support.altair.com/community?id=community_blog&sys_id=d1475b96dbf62050cfd5f6a4e29619c8&view_source=featuredList
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Altair Employee