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Given a volute pump casing, the impeller, and RPM how would one obtain a simulated head-flow graph? As for what I have seen in research papers most methods already assume input flowrate / pressure and even output head. However, in my case I do not know the inlet flowrate. It is determined by the impeller itself, right?

What I'm asking for is a globally outlined procedure of how such a problem could be solved. Mainly, what should be assumed and what will be simulated.

The pump has an inlet hose into a water reservoir (say h meters below inlet) and is fully primed/submerged in water. RPM is known as well as are the CAD models of pump and impeller.

Schematic

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It is common to use CFD simulation of a given pump geometry to predict a performance curve for the pumps volumetric flow rate vs. a range of pressure difference (head) that the pump is seeing. Advanced tools can even take into account the onset of cavitation, which will limit the operating range of the pump. Here is a good summary of how this analysis is routinely done in the cloud-based CFD platform SimScale.

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