Problem regarding hexagonal mesh of complex geometry.
 

Hey.
I am new to CFD and I have been given a project in CFD. So I need your help.
I want to model the flow of air inside a spray dryer for which I have to develop a geometry. The spray dryer is a cylinder on cone type with a annular inlet at the top. The outlet pipe of the spray dryer starts from within the cone volume.
I have developed the geometry by splitting the outlet pipe wall from the cone volume but now I am not been able to mesh the remaining volume using hexagonal mesh. i have tried with tetrahedron mesh but result are having some error.
Please help me.
Thanks in advance.

Request
 

I am new in CFD in general and in dis forum. please I need help with creating a hollow in the solid of my spray dryer using design modeler and my research time is almos up and I av done nothing can You help me?
Thank You!