Home
Appendix
This section provides additional information about how to estimate simulation time, supported EDEM File types, attribute definitions, and so on.
Known Issues
This section describes the known issues in EDEM version 2025.1.

Welcome
What's New
This section describes the key features in EDEM version 2025.1.
About EDEM
EDEM is a high-performance simulation software for bulk and granular materials.
Hardware Requirements
This section details the minimum system requirements and requisites for running EDEM.
Release Notes version 2025.1.1
This section contains information about the EDEM 2025.1.1 release, such as bug fixes.
Release Notes version 2025.1
This section contains information about the EDEM 2025.1 release, such as key features, enhancements, and bug fixes.
Tutorials
Start using EDEM 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.
EDEM Analyst
EDEM Analyst is the post-processor used to analyze and visualize the results of your simulation.
EDEM Physics 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.
EDEM Calibration Kits
The EDEM Calibration kits are a collection of EDEM models of standard bulk solids characterization tests commonly used for EDEM material model 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 File Types
  This section lists the EDEM file types, including Standard and Optional supported file types.
- Estimate Simulation Time
  It is challenging to estimate the exact real time required for a DEM simulation, as each simulation and each computer is different.
- Attribute Definitions
  The following tables provide detailed descriptions for Particle, Geometry, Contact, and Collision attributes.
- Calculate Characteristic Length
  The Characteristic Length is the average length of each feature in the CAD file.
- Disable FMA in CUDA
  The CUDA compiler applies an optimization method known as Fused-Multiply-Add (FMA) which combines addition and multiplication into a single instruction.
- Use EDEM on a Remote Desktop
  Generally, simulations are set up on Windows. However, the simulation is run on a Windows or Linux processing machine which is remotely located.
- Command Line Example Commands
  This section provides examples of the default processing options, and how to specify processing options and run simulation and export data.
- Known Issues
  This section describes the known issues in EDEM version 2025.1.
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.

Known Issues

This section describes the known issues in EDEM version 2025.1.

Non-manifold Geometry sections from legacy decks

In versions prior to EDEM 2024, Geometries could incorrectly be assigned as volume (closed) Geometries instead of surface (open) Geometries. From EDEM 2024 onwards, if non-manifold Geometries (when more than two triangles share the same edge) are loaded from an older deck, they will be converted to surface (open) Geometries. This will not affect simulation behavior unless the Geometry has volume packing, a factory attached, or if the mass, center of mass, or Moment of Inertia was being used (in which case, it is recommended to recompute them in the Geometry Mass tab or re-import the CAD file). A warning will be displayed when this conversion happens.

EDEM Solver Compatibility

The EDEM Solver Engine has some restrictions on the types of simulations it can run in the current version. For more information about solver capabilities, see EDEM Solver Capabilities.

MotionView Geometry Import

To use the parent-child functionality in EDEM with a rotating Geometry imported from MotionView, the Geometries local origin must be moved using the local origin offset to the center of the geometry. If the local origin is not at the center of the rotating Geometry, the child will move around an axis relative to the automatic local origin (0,0,0). This will cause the child to move in unwanted directions.

EDEM CPU utilization higher than expected

On some computers, the Windows Task Manager can show that EDEM is using significantly more CPU threads than expected. This will typically happen when there are many idle CPU threads available. As a workaround, you can create the following environment variable:OMP_WAIT_POLICY=passive. This will restrict the number of CPU threads EDEM is using to the number that you have specified. Testing has not shown this issue to have any noticeable effect on simulation performance.