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EDEM Contact Models
A Contact Model describes how elements behave when they come into contact with each other.
Plug-in Contact Models
You can add Plug-in contact models to a simulation.
Residence Time in Geometries Models
The Residence Time in Geometries contact models allow you to track the total time spent by specific particle types inside the boundaries of one or more predefined geometries: a sphere, a box (cuboid), or cylinder.

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.
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.
- Base Contact Models
  Base Contact models define the physical collision between particle materials or particles and geometries.
- Rolling Friction Contact Models
  Rolling Friction is the resistive force that slows down the motion of a rolling object.
- Spinning Friction Contact Model
  The Spinning Friction contact model is used to account for the friction that would occur if a particle face is rotating against another particle or Geometry.
- Additional Contact Models
  You can also add Additional contact models to a simulation.
- Particle Body Force Contact Models
  You can define a particle body force to act on particles when a specified condition is met, when particles are in certain positions, or are traveling at a specified velocity.
- Plug-in Contact Models
  You can add Plug-in contact models to a simulation.
  - Linear Elastic Bonding Model (LEBM)
    The Linear Elastic Bonding contact model (LEBM) consists of elastic bonds, providing a different type of behavior than the Bonding and Bonding V2 models.
  - Residence Time in Geometries Models
    The Residence Time in Geometries contact models allow you to track the total time spent by specific particle types inside the boundaries of one or more predefined geometries: a sphere, a box (cuboid), or cylinder.
    - Calculate the Custom Residence Time Property
      For particles that meet the following criteria, the Custom Residence Time property associated with these three plug-ins adds the value of the current Time Step (in seconds) to the property.
    - Use the Residence Time in Geometries Models
      You must first add the Residence Time in Geometries model to the Physics of a specific EDEM simulation and then modify as required in order to be used.
    - Post Processing
      After a simulation has run with one of the three Residence Time in Geometries models enabled, EDEM Analyst displays the new property.
  - Hydrodynamic Lubrication Model
    The Hydrodynamic Lubrication contact model simulates the effect of short-range hydrodynamic forces on particles as though they were saturated in a fluid.
- Field Data Manager
  Field Data Manager allows you to import and manage field data for use in a Custom model (typically, a Particle Body Force).
- Contact Model and GPU Device Compatibility
  The Multi-Sphere solver can run on two different engines such as CPU and CUDA.
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.

Residence Time in Geometries Models

The Residence Time in Geometries contact models allow you to track the total time spent by specific particle types inside the boundaries of one or more predefined geometries: a sphere, a box (cuboid), or cylinder.

The time spent is stored in a Custom Residence Time property, allows you to analyze the particle residence time in specific volumes of interest.

Note: To eliminate confusion, the Residence Time attribute already accessible in the Analyst always tracks the overall amount of time the particle has spent in a simulation, regardless of its location.

The three Residence Time in Geometries models allow you to:

Add each of the particle types included in the simulation to the plug-in, determining which particle types should be taken into account when calculating residency times.
Specify the parameters that describe the Geometry for the plug-in:
- Box
  - Center (x,y,z)
  - Size (x,y,z)
  - Rotation (x,y,z)
- Cylinder
  - Start Point (x,y,z)
  - Start Radius
  - End Point (x,y,z)
  - End Radius
- Sphere
  - Center (x,y,z)
  - Radius

Note: Each plug-in can describe only one Geometry at a time, while all of them can be used simultaneously. This means that you can track the residence time of a particle inside a box, cylinder, and sphere in a single simulation.