Reply To: Calculation of a centrifugal pump in fluent

[Satish]

Additional note when modeling pumps with incompressible liquid: The constant density of the fluid will show low negative pressures where flow accelerates. This is expected from such a numerical simulation. Typically at such locations, the cavitation would occur so pressure gets clipped just around vapour pressure. Usually this low negative pressure region is small and localized so its ignored when doing performance computations. 

If the low negative pressure values are of concern, then you would need to model cavitation to clip this.