[Elhussien]

Greetings all,
I'm simulating a cyclone separator, I had created un unstructured hexahedral mesh and adjusting the solution model to be RSM.
I started the solution with steady gas only in the model with coupled pressure solver until convergence of 1e-5.

Now I want to start particle injection to simulate the separation with several loadings, I mean from dilute loading "one-way coupled" then much higher "two-way" and finally some 4-way coupling.

My problems:
1- some concerns -not clearly showed in fluent guide - about particle treatment.
2- How exactly determine both separation eff. and pressure drop? and when to stop?