In a mixing vessel using MFR, where there is a rotating impeller with known torque on the blades. How can I find the rpm of the impeller?
Suggest that you carry out 3 runs of CFX for the rotating impeller MFR calculation. 1. Run1  you specify an initial guess for the angular velocity omega, and the code will then calculate the torque on the blade. This will probably give a slightly different value of torque to that required. 2. Run 2  change the value of omega slightly from that used in Run1 to get a new value of the torque. 3. Run 3  As the relationship between torque and omega is a linear relationship, it should then be straight forward to cextrapolate from run1 and Run2 a new value of omega that you need to give the wanted torque 

