Hi JianChen Thanks for responding. I am using FENSAP 2021 R1 to simulate and I am using just FENSAP not FENSAP-TURBO. My domain is shown in the attached image - I have placed the turbine in a relatively large 'tunnel' with a frozen smaller refinement domain (white box outline) to allow for a more refined mesh closer to the turbine.
(I've hidden the inlet and outlet to view the domain easier)
Any help is greatly appreciated