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pump prevalence at low mass flow rates

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Old   January 8, 2011, 17:05
Unhappy pump prevalence at low mass flow rates
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Caterina
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Hi everybody,
my question deals with simulation of water pumps.

I simulated a water pump at different mass flow rates as inlet condition and compared my results with experimental data. I worked with MRF model with a commercial code.
At maximum mass flow rates (water valve completely open) prevalence results agree with experimental data very well. At contrary, at lower mass flow rates prevalence is over-estimated, and error grows at diminishing of mass flow rate and at growing of rotational velocity.

Has anybody a suggestion to explain this phenomenon?

Thanks,

Caterina
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