splitting volume for compressor

jai

i'm analysing compressor housing's fluid flow for efficiency.

how can i split/trace the fluid volumes from inlet to outlet of the compressor housing including wheel.

i want to trace closly on wheel and scroll area.

now i'm splitting 3 volumes for my analysis. 1. from inlet to wheel end 2. scroll area 3. housing - this is solid volume

those are all nessary for analysis or any other method avail for accurate analysis.

after meshing i face problem in cfx solver, 1. overlap % in rotor zone is 9% 2. domain imbalance is 40% in rotor zone only