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getting problem in calculating torque required for centrifugal pump

Hi everyone,
I am working on the simulation of the centrifugal pump. The problem is that i have speed of pump N=2900 RPM and i want to calculate the torque required by the pump for different discharge.
Somebody please help me.
its urgent b'coz i have to submit my thesis soon.

you can use function objects in controlDict file which can calculate the forces and torques at the patch required.

Code:

functions

{

     forces

     {

               type forces;

               functionObjectLibs ("libforces.so");

               patches (rotor);

               rhoName rhoInf;

               rhoInf 1.0; // need to multiply result with your assumed density in kg/m3 in order to get N m

               CofR (0 0 0); //Origin for moment calculations

               outputControl outputTime;

               outputInterval 1;

     } 

}

However it gives me weird values for my case, I am confused if its problem with the function object or some problem with the case.
But I am not sure it works for you or not.

Let me know if it helps and give you reasonable results

All the best :)