Home
EDEM Simulator
EDEM Simulator is a powerful solver used for fast and efficient simulations.
Dynamic Domain
When you define a Geometry object as a Dynamic Domain, all material inside the object will be active, and EDEM excludes any stationary material outside the object from any calculations, therefore, improving simulation speed. Dynamic Domain is based on the method outlined in Mio et al., 2009.

Welcome
About EDEM
EDEM is a high-performance simulation software for bulk and granular materials.
What's New
New features and enhancements available in EDEM.
Release Notes
This section contains information about the EDEM release, such as key features, enhancements, bug fixes, and known issues.
Tutorials
Start using EDEM functionality with our interactive tutorials.
Get Started with EDEM
The EDEM user interface comprises three icons for each simulation component - Creator, Simulator, and Analyst.
EDEM Creator
EDEM Creator is the pre-processor for creating an EDEM simulation model, including setting up equipment and defining the generation of bulk materials.
EDEM Simulator
EDEM Simulator is a powerful solver used for fast and efficient simulations.
- Set Simulator Parameters
  You can set simulation parameters such as the Time Step, simulation time, grid options, and Simulator Engine for the CPU mode, along with the GPU parameters.
- Start and Stop a Simulation
  The current simulation time along with all the previous time steps are displayed in the Viewer Controls pane.
- Dynamic Domain
  When you define a Geometry object as a Dynamic Domain, all material inside the object will be active, and EDEM excludes any stationary material outside the object from any calculations, therefore, improving simulation speed. Dynamic Domain is based on the method outlined in Mio et al., 2009.
  - Dynamic Domain Known Issues
    Dynamic Domain has the following known issues:
- Select the EDEM Simulator Engine
  You can run a simulation in CPU or GPU engine mode. However, the GPU mode requires supported GPU hardware.
- Run EDEM in Batch Mode
  EDEM's Command Line Interface allows you to run EDEM in batch mode without using the GUI.
- Reduce Simulation Time
  The time taken by the Simulator to perform a single iteration, t_iteration, is affected quite significantly by the simulation parameters.
EDEM Analyst
EDEM Analyst is the post-processor used to analyze and visualize the results of your simulation.
EDEM Contact Models
A Contact Model describes how elements behave when they come into contact with each other.
EDEM Cal Utility
EDEM Cal is a utility which works with EDEM and is designed to assist in performing calibration.
GPU CUDA Guide
The EDEM CUDA GPU module uses the latest General Purpose Computing on Graphical Processing Units (GPU) technology.
Programming Guide
The EDEM Programming Guide describes the EDEM API.
Coupling Interface Programming Guide
The Coupling Interface Programming Guide provides an overview of how to use the EDEM Coupling Interface to couple with a generic CFD code and/or Multi Body dynamics codes.
EDEMpy
EDEMpy is a Python library for accessing EDEM data from .h5 files (the underlying EDEM file format). EDEMpy does not require prior knowledge of advanced programming.
EDEM Solver Capabilities
EDEM contains four solver engines.
Appendix
This section provides additional information about how to estimate simulation time, supported EDEM File types, attribute definitions, and so on.
EDEM Terminology
Definitions of terms used in EDEM.
References and Bibliography
This section cites the contributions made by various authors and sources that have been used as reference material for EDEM, and the specifics of how they have been applied can be found in the individual contact model sections.

Dynamic Domain

When you define a Geometry object as a Dynamic Domain, all material inside the object will be active, and EDEM excludes any stationary material outside the object from any calculations, therefore, improving simulation speed. Dynamic Domain is based on the method outlined in Mio et al., 2009.

To use Dynamic Domain:

Define a Geometry section as a Dynamic Domain in EDEM Creator.
Right-click Geometries.
Select Add Geometry and then select Box.
Rename the new Geometry and set the Type to Dynamic Domain.

Note: Since the bulk material will not physically interact with the Dynamic Domain object, the option to assign material when Dynamic Domain has been selected is not available.
Set the dimensions of the Dynamic Domain object suitable for the simulation.
- A particle excluded from any calculation is called a frozen particle. If a frozen particle re-enters the Dynamic Domain, then it is automatically included in the calculations again.
- Any material within the domain will be active, but any material outside the domain may become frozen.
- While simulating, frozen particles are shown in blue/black, while unfrozen particles are shown in yellow as follows:
  
  The black coloring is shown only on the CUDA solver. It indicates that the particles are not only frozen but, have also been completely offloaded from the GPU (further increasing performance). The difference is only visible while simulating; it does not impact results.
Set the following parameters for Dynamic Domain:
- Check Interval
  If the particle does not move in this time interval and it is outside the Dynamic Domain, then it is flagged to be frozen.
- Number of Checks
  This determines the number of times EDEM will perform the check to see if a particle is to be frozen.
- Displacement of Particles as a Percentage of the Radius
  This condition determines if the particle is stationary or moving. If the displacement of the particle within the defined Check Interval is greater than this value, then the particle is considered to be moving, otherwise it is stationary and can be removed from the force and contact detection calculations.