Problem during meshing

(I’m not sure is this subject about how-to or bug report)

I am working on a circulating fluidized bed gasifier. This part is a cyclone. I saw a problem when I try meshing.

I tried different ways (also using control points for the meshing) but I didn’t solve that gap which is shown picture.

9_2020-04-25T161742.464561.zip (19.8 MB)

You need to add some thickness to the outlet.