[Yosri AB]

Hi,
Urgent ! need help

I'm working on a centrifugal pump, the goal is to evaluate the performance curve of the pump (i.e head vs flow rate) now, i started by using a Total pressure inlet (0 atm) and a mass flow outlet and by changing the desired outflow i would just simply calculate the delta p based on that flow rate and deduce the elevation ..however, i was told that i need to do the opposite thing, meaning that i have to impose a head value and then evaluate the out flow as a result .
the problem is I can't find a way to impose that condition, let's say that i need to find out the flow rate of the pump at a total head = 30 m ..how can use that 30 m to determine the pressure needed at the outlet since i have no information about the flow velocity

any suggestions please ??
Thank you