Creator Tree-Physics

The Creator Tree-Physics allows you to add Physics interactions.

You can select any of the following interactions:

  1. Particle-to-Particle contact models
  2. Particle-to-Geometry contact models
  3. Particle Body Forces

Adding Contact Models

A contact model describes how elements behave when they come into contact with each other. Using the Interaction pulldown menu and + pick-list, you can build a list (stack) of contact models. The top element is applied first, then the next one down and so on. The models are automatically ordered. If an API model is added, use the up and down keys to move the contact model up and down the list.

The contact models are divided into Base Contact Models, Rolling Friction Models, and Additional Models. 

Base Contact models define the physical collision between particle materials or particles and geometries. Typically, the Base Contact model consists of spring forces and damping forces in the normal and tangential directions. You can add only one model per simulation.

Rolling Friction models are included to factor in the significant rotational resistance and energy loss during rotation. Most models include a Rolling Friction component to account for the materials resistance to rolling. You can add only one Rolling Friction model per simulation.

Additional models such as bonding, heat conduction, wear, cohesion (if it is not included in the base model) and electrostatics can be included in addition to the Base and Rolling Friction models.

To add a model:

  1. Select Edit Contact Chain and select the Base Model from the dropdown.
  2. Select the Rolling Friction Model and finally select the checkboxes to select and add Additional Models.
  3. To remove an item, select Edit Contact Chain to de-select additional Models. If Rolling Friction or Base model is not required, (for example if an API model has been used), select the No Base Model or No Rolling Friction model.

EDEM version 2020.1 and above allows you to select No Base Model and run the simulation from the command line.

Click Preferences to configure the selected model.

EDEM is supplied with several integrated contact models. You can also add custom plug-in Contact models by selecting the checkboxes in the Edit contact model chain section. API models are displayed here if the custom model (.dll or .so file) is in the same location as the simulation .dem file or the folder is defined in Tools > Options > File Locations. The first location checked in the .dem file location and the folder defined in the Tools Menu is checked secondary to this.

For more information about creating API models, see the EDEM Programming Guide.

When using the GEMM database, the Contact Model information is automatically populated by the GEMM Wizard. This means that any Base Model or Rolling Friction Model will be replaced by the model associated with the GEMM database. If you would like to use a different Base Model or Rolling Friction Model, you should make this change after you have finished using the GEMM Wizard. Any Additional Models set up prior to using the GEMM Wizard are unaffected.

When opening simulation decks from an earlier release of EDEM (earlier than EDEM 2018.2), the Contact models used will be updated to the new format where they are divided into Base Model, Rolling Friction Model, and Additional Models.

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