Thank you. I will look into it. In the mean time, I also did a transient simulation using SSTCC model on Grid 4. This didn't result in much difference. I want to evaluate the potential differences when using resolved boundary layer (y+<1) instead of wall functions (y+>30), but I'm struggling to get the mesh using Fluent Meshing. Main problem is where the tangential inlet intersects with the cyclone main body, as well as the 'bottom' of the vortex finder. Any suggestions regarding this? I've noticed that others rely on ICEM CFD or Ansys Meshing.
P.s. for completeness of the previous plots, comparison with SST without Curvature Correction as well:
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