Keyur Kanade
Ansys Employee

You will need to decompose it further. Please check following video on hex meshing. 

Please check following videos

Ansys Meshing: Decomposition for hex meshing:

Ansys Meshing: Meshing Methods:

Please go through help manual for more details 



How to access Ansys Online Help Document

Guidelines on the Student Community

Fluids Engineering Courses | Ansys Innovation Courses