polyhedral mesh which is generated directly in Workbench Poly Meshing for Fluent
 

Dear all,
Do you know the difference between polyhedral mesh which is generated directly in Fluent and generated by Workbench Poly Meshing for Fluent (from ANSYS App Store)?
I face the meshing problem. Usually, I make polyhedral from Ansys meshing by generating tetrahedral mesh then convert it to polyhedral in Fluent Window.
When I make half of the default value in Max Tet Size, Max Face size and min size (to check grid independence) by then converted into Polyhedral with the above steps. But, Now, Ansys meshing fails to work in one part of my geometry. The Ansys Meshing seems to freeze.
I think Workbench Poly Meshing for Fluent (from ANSYS App Store) could be the solution.
Do you have Any Idea about it?
Thank you for your help