Star- CCM: 2D H- Rotor performance simulation problem
 

Hi there, I am currently simulating a 2D H-Rotor (or darreus rotor) in Star- CCM. The setup is as below:
https://imgur.com/a/OV4WTVy

I am not sure why the moment coefficient only increases exponentially along with increasing TSR.
Following is the mesh setup:

https://imgur.com/a/hCnih2J

And the result I obtained is below:

https://imgur.com/a/KDvLFhH

Any help will be appreciated. Thanks a lot.