How can I calculate the torque of the impeller blade in a stirred tank reactor?

Report/Force Choose Moment and the axis-rotation (also the center of rotation) of your impeller

Thanks 4 yr mail. Can u use this moment as a criterion for the stability of my model? If it does converge, do u know why?

sure: if you monitor the torque on a piston and it doesn't remain stabil (oscillations) then it is possible that you have unsteady phenomen

Hey Mary,

I have been trying to model rotating blades. Can youn tell me how you set up Fluent for the case of your impeller blades?

How do u mean? Have u modelled your tank? If so, u read yr case file into fluent. there are two methods: Multiple frame of reference or Sliding mesh. Check Fluent tutorial for this. does this help

Actually my case is not of impeller blades, it is of rotating helicopter blades, so there is no tank, there is only a pressure far-field. Can you tell me how to set up the problem? I have tried to make the fluid rotate in a direction opposite to that of the blades and keep the walls stationary (in this rotating frame). But this does not give the correct solution. I have looked up the fluent tutorials, but since they only show 2D cases in them, they were not much of a help. I checked some previous posts on this forum too, but the problem is not resolved. Can you tell me step-by-step, how you set up the wall and fluid boundary conditions for the case? I am using a Spalart-Allmaras turbulence model, coupled implicit solver. Thanks in advance, this will be great help.

NY.