You can prevent particles from leaving the container with several operators, depending on your needs. For example, you can use a Collision operator to have the particles bounce off the container. You could use a Surface Test to test for particles that leave the container and delete them. Or you could use a Push In/Out operator to just push any outside particles back in. Make sure the timing of whichever operator you choose is set to continuous.
Simulating particles & liquid in a cyclone
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