Reply To: Cyclone (Stairmand) simulation using RSM

[Sem B.]

 

I think that now I start to understand what is going wrong with the axial velocity profiles: 

As you can see, the axial velocity is predicted too low, even negative, at the center for both SSTCC and RSM. I think this is a direct result of the backflow from the pressure-outlet at the top, that is now ‘pushing fluid’ into the boundary exactly in the same direction of the shift in axial velocity at the center. Currently, I’m using standard backflow settings, so direction normal to boundary and uniform total pressure, which is not really correct. I’m still thinking on how to improve the settings of the backflow, but I’m convinced this is contributing to the differences between CFD and experimental data.