Hello, I found the method in the attached paper, in Fluent, you have to input the suitable reference area and the other values to get a predicted value for the moment, you can monitor the moment value and make it for the impeller..then you can calculate the numerical input power that is a simulation for the electric input power , then you can get the fluid output power from the numerical head and get the efficiency...the moment increases with increasing the flow rate at the same design....Thanks