# Torque calcuation

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 June 29, 2006, 16:01 Torque calcuation #1 Mary Guest   Posts: n/a How can I calculate the torque of the impeller blade in a stirred tank reactor?

 June 29, 2006, 23:17 Re: Torque calcuation #2 mAx Guest   Posts: n/a Report/Force Choose Moment and the axis-rotation (also the center of rotation) of your impeller

 June 30, 2006, 08:56 Re: Torque calcuation #3 Mary Guest   Posts: n/a 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?

 July 3, 2006, 00:53 Re: Torque calcuation #4 mAx Guest   Posts: n/a 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

 July 3, 2006, 09:49 Re: Torque calcuation #5 Fluent learner Guest   Posts: n/a 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?

 July 6, 2006, 19:53 Re: Torque calcuation #6 Mary Guest   Posts: n/a 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

 July 11, 2006, 10:50 Re: Torque calcuation #7 Fluent learner Guest   Posts: n/a 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.

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