Processing Options

Processing options are used to determine how each simulation will run.

To use the processing options:
In the EDEM Cal page, select Parameter Editor and specify the following details:
For Specify
Time Step Indicates the amount of time between iterations (calculations) in the Simulator. The value is displayed as the actual Time Step (in seconds).
  • Auto Time Step

    Select the checkbox to automatically adjust the Rayleigh Time Step to the smallest radius that is currently in the simulation rather than the smallest radius to be created. It uses 20% for this particle size. For example, a simulation that has 10 mm particles from t=0s and 3 mm particles from t=3s will use 20% of the Rayleigh Time Step obtained with 10mm until time 3s, when it would be updated to the Time Step value obtained with 3mm.

  • Fixed Time Step

    Select the checkbox to ensure that the Time Step remains constant throughout the simulation.

For more information on selecting an appropriate Time Step, see EDEM Set Simulator Parameters.
Simulation Time Indicates the amount of real time your simulation represents.
  • Total Time

    Select to set the total actual length of the simulation in seconds or minutes.

  • Limit Simulation Steps

    Select to run the simulation for a given number of steps.
Data Save
  • Export Data per Interval

    Select to export data per write out interval during simulation.

  • Target Save Interval

    Select the write out interval for saving EDEM data.

  • Compress Data

    Select the checkbox to enable or disable data compression on saving. Compressing data saves space, but may result in longer simulation run times.

Simulator Grid Since EDEM calculates the smallest particle size in the simulation (Rmin), you set a grid cell size based on this particle size. 3 Rmin is the default value, and the typical ranges are 3-6 Rmin.

Estimate Cell Size provides guidance on the optimal Cell Size for a specific simulation Time Step. The grid does not impact the simulation results, only the simulation speed. A smaller grid size results in more memory (RAM) usage; reducing the grid cells size below 2 Rmin can result in a significant slow-down for the simulation.

  • Auto Grid Resizing

    Select to determine the grid size based on the simulation and the available computer memory.

  • Cell Size

    Set the cell size manually or automatically based on the auto grid resizing.
Simulator Engine Indicates the Simulator Engine options similar to those in the EDEM interface:
  • Selected Engine
  • CPU
  • GPU
  • The Number of CPU Cores per simulation
  • Device Index - Indicates which GPU card should be used for the simulation. To determine the device index, open EDEM > Tools > Options > Simulator Engine. The Device index is listed next to the name of the device. Alternatively, this can be determined from the command line.
  • GPU Split - If you are using Multi-GPU, then select an axis to split the simulation.
Dynamic Domain Method If using the Dynamic Domain the Check Interval, specify the Number of Checks and Displacement of Particles.
Coupling Server If running the simulation using the Coupling Interface, select the option to add any additional inputs for the coupling to the coupling command text box.
Licensing Specify the licenses if the simulations are run using licenses from a specific licensing server. Select the Wait checkbox to ensure that if license keys are not available for the simulation. the simulation will wait until they are available before continuing.
Advanced You can select additional parameters using these checkboxes. For more information on the parameters, see EDEM Simulator Settings.