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Whether the derived contact force is a single contact

shiw · 2024-12-04T01:17:22+00:00

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shiw

Is the data derived from the contact force the force of a sing.le contact at this moment, or the total force of all contacts at this time? I saw that there is a textbook that says that it is a single contact, so I want to verify the following. Thank you.

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v2024

Accepted answers

Stephen Cole

Hi,

Average force in the EDEM screenshot is the average force across multiple Contacts at one point in time, this is different to the average force of a single particle Collision.

The text book refers to Collisions as well as Contacts. A Collision is something that happens over a set time period, it has a start time, end time, maximum force etc associated with it.

One Collision can be made up of multiple Contacts, EDEM calculates new contact forces each time-step but these may all be associated with an ongoing collision.

https://help.altair.com/edem/topics/edem_simulator/track_collision_data_c.htm?

EDEM stores Contact data by default but not Collision data, I would not recommend using Collisions generally as they are not supported on GPU.

The query below is set to export the Average contact force between New Particle 2 and Unnamed Section 29.:

If you have 10 different particles all contacting the same geometry, at each save data point each particle will have a contact force associated with the geometry, and Average will be the average value of these 10 points. If you exported Standard you would get a force for each contact at that specified point in time.

https://help.altair.com/edem/topics/edem_analyst/exporting_results_data_t.htm

Regards

Stephen

All comments

PrasadAvilala

Hi Shiw,

As per your selection shown in the picture is, its a Average contact normal force between

New Particle 2 and Unnamed Section 29.

if you want a specific element normal contact force between New Particle 2 and Unnamed Section 29

define bin and call that bin in the Selection i.e Currently Selection is All but if you create a bin please call bin so that EDEM extract force between New Particle 2 and Unnamed Section 29 at bin location

Hope this is clear

Thanks,

Prasad A