I need some suggestions on CFD Analysis of microturbine ( speed above 1,00,000rpm)..

i am planning to use ANSYS-CFX as i need to proceed with FSI of blades after getting forces from CFD..

Details- Curved blade rotor, 8 blades, axial flow, clearance btw wall 1mm.

I am planning to use sliding mesh to the rotating interfaces since unsteady conditions may exist.

My Query- How to mesh fluid and solid region, whether rotating parts alone meshed separately or stationary volume also need to be meshed along with it..

Does it requires to define the boundary btw blades and hubdisk since both are rotating..but separate..

I am using Sliding mesh for first time,, looking for some tips