With blades, it is very very very difficult to get hex mesh in that domain. You may need to use ICEMCFD for that. So right now you will have to use inflation plus tet mesh.
For adaption, please see following in help.
2020 R1 > Fluent User's Guide > 48.2.55. Manage Adaption Registers Dialog Box
Fluent User's Guide Contents 48.2.55. Manage Adaption Registers Dialog Box The Manage Adaption
2020 R1 > Fluent Theory Guide > 29.1. Adaption Process
Fluent Theory Guide Contents 29.1. Adaption Process The adaption process is separated
2020 R1 > Fluent User's Guide > 38.5.1. Performing Geometry-Based Adaption
Fluent User's Guide Contents 38.5.1. Performing Geometry-Based Adaption The Geometry Based
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