I had a few discussion with my team and I also run a few tests and the conclusions are as below:
- Discovery Live applies Rotating wall Boundary condition on only axially symmetric faces.
In the model shared by you, the Rotating wall BC has been applied to a half-cylinder face.
Thereby resulting in inaccurate results.
- Performing a similar analysis using an axially symmetric face gave me consistent results.
The results did not fluctuate in any unexpected way with varying fidelity.
Higher fidelity produced a more accurate result.
The Flow rate at Inlet and Outlet were consistent at different fidelity.