How to visualize particles trapped on surfaces using the DPM

This option is not directly available in the Results section, but it can be accessed by following the procedure below.

1. Solve your DPM model as usual. In this example, the setup involves a pipe with several 90° bends, where most of the particles become trapped due to the operating conditions—such as flow velocity, particle size, and density.

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2. Go to the Results Tab > Model Specific > Discrete Phase > Sample

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Create a Sample file for the walls. In this model, there is only one named selection for the wall surfaces. However, if you have multiple named selections for different walls (e.g., wall-1, wall-2, etc.), be sure to create a separate file for each one.

Click on Compute and Save the file (*.dpm).

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3. Change the file extension from '.dpm' to '.inj'. If you prefer to keep the original .dpm file, create a copy before renaming.

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4. Save your project and create a copy, as the next steps will involve modifying the setup. Open the copied project and go to Models > Discrete Phase > Injections panel > Create. You will see the original injection (injection-0) that was created and used in the initial project.

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5. Choose an appropriate name and select ‘File’ as the Injection Type. Import the .inj file created in Step 3. Click OK and close the window.

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6. Open the DPM model setup and adjust the settings as shown below. Click OK and close the window.

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7. Go to Solution Initialization > Standard Initialization, and set all velocity components to 0. This creates a stagnant fluid. Then click on Initialize.

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8. Go to Results > Graphics > Particle Tracks > Create New. Set the Track Style to "Sphere" and select the injection you just created. Click on Save/Display. Make sure to select all the injections corresponding to the different walls (see Step 2).

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Summary

Visualizing trapped particles requires creating sample files and converting them into injection files (.inj). These files are then used to define new injections in the DPM model setup. After initializing the model with zero velocity, you can visualize the trapped particles by plotting particle tracks using the "Sphere" style.