I am simulating a Caradonna - Tung ( CT) rotor in Xflow. THe rotor has zero blade twist and has a total pitch of 8 degrees. I have enclosed the blade in a rectangular domain where the free stream is directed from the bottom up at different velocities which are: 1.985m/s, 3.97m/s, 5.955m/s, ......, 11.91m/s respectively.

The issue I am having though is whenever I check the Cx or Fy of the simulation through the function viewer, the vibration is very huge. I do not know what causes the vibration , can anyone help please?

XFlow ​​​​​​​