Hi,
On the particle trace side of things: when particle traces hit a solid wall (i.e. a no-slip wall), they will ‘disappear’ from the viewer, but they are still accounted for from a mathematical perspective in the simulation.
As a tip: you can use a cutting plane as a seed face for your traces. This might give you a better visualization.
On a side note: I would have expected this equipment to be simulated with a rotating zone, not with a rotating wall. So your first link looks better than the other ones.
Cheers