I set the bottom face as the trap and the vortex finder outlet as the escape. Is it possible to see particle behavior inside the cyclone near the trap section? because when I zoomed in, I could not see how they turn in the mentioned section (core section)
I have two more questions: I considered restitution of coefficient = 0.6, It means that particles could not stick to the walls? according to the picture below, particles are stuck near the wall, why is the reason for that?
how can I get a solid volume fraction contour for this cyclone? because in the contour section, there is no solid fraction variable. 
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