EDEM API - Contact Model: Coefficient of restitution as a function of impact velocity

Renan

Overview

This API allows the user to simulate dynamic impacts by implementing a version of the Hertz-Mindlin model, where the coefficient of restitution (COR) varies as a function of the impact velocity. The API reads data from a preference file, which contains a table of impact velocities and their corresponding COR values. The API applies the custom COR values for both particle-particle and particle-geometry contacts.

Pre-Requisite

EDEM 2024.0 or newer

Usage/Installation Instructions

Place the DLL and the preference text file in the same directory as your EDEM simulation. The text file must follow this specific format: the first line should contain the header, and each subsequent line must be divided into two columns and comma-separated.

Nakwon

It is really helpful!

As far as I know, if I place two DLL files and the preference text files in the same directory, I can see two plug-in contact model in physics configuration in EDEM Creator.

However, in my case I need 4 different contact model; one between particles, and three between particle and each geometry. According to the one between particles, it does not have any issue.

Is it available to define 3 plug-in contact models for one simulation to apply different trends of coefficient of resitution between particle and each component in a simulation?

Renan

Hi Nakwon,

You don't need two dll files in the same folder. If you wish to use the model as both particle-particle and particle-geometry contact model, all you have to do is select the model for both interactions.

If you want to use different tables for different interactions, you'll have to modify the API to accommodate that. Keep in mind that any API can only have one preference file, so you'd have to put all CoR values on the same table or come up with a different format.

Best regards,

Renan

Nakwon

Hello Renan,

Thanks for your reply on it.

In my model, there are a couple of materials, for instance, plastic and metallic mateirlas that make up the geomerical configuration. Their material properties are quite different each other so I would like to ask you about the possibility of applying more than one particle-geometry contact model to an EDEM simulation.

Or just one particle-geometry contact model affects all the interactions between shot and geometry.

Best regards,

Nakwon