Performing DEM Calculations

Before running the DEM calculation, make sure you have:

1. Built your transfer chute model – see Chute Drawing Data Structure.
2. Entered the Feed box and Pulley details.
3. Set the DEM Inputs.

The buttons that control calculation, recording and playback are on the main form above the chute drawing:

• Draw – draws (or re-draws) the chute and feed boxes. Adjust the view using the drawing settings and mouse controls first.
• Calculate – starts the DEM calculation; the button changes to Stop Calculation while running, so you can pause to rotate/inspect the model and press Calculate again to resume.
• Record Calc – starts recording the calculation for later playback and reporting (changes to Stop Recording Calc) – see Recording Calculation Results.
• Playback... – loads and replays a previously saved recording.
• Record Video... – records the on-screen drawing to an MP4 file – see Record a Video (MP4).

Suggested workflow

1. Start with a low feed rate (tonnes per hour) and a large particle size (150–200 mm) to get a fast first look at the flow.
2. Use Stop Calculation to pause and inspect the model with your mouse or the drawing settings.
3. Adjust chute faces and layers as needed, then continue or restart the calculation.
4. As a final run, reduce particle size and increase the feed rate towards realistic values – you'll likely need to re-tune the DEM inputs for the new particle size, see Fine Tuning DEM Inputs and DEM Theory.
5. Record and play back a run for detailed analysis, especially for a model with many thousands of particles – leave the calculation running and recording while you do other work.
6. View or print reports and trace particles.