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Pump characteristic / performance curve

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Old   January 3, 2012, 11:45
Default Pump characteristic / performance curve
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Hi all,

I am trying to build the performance curve of a centrifugal pump.
I do know the design point (mass flow rate and rpm).

However I need the performance curve (mass flow rate vs. head).
I tried the followings:

1) I set 40, 60, 80, 140, 160, 180 percent of design mass flow rate at the inlet and monitored the output pressure. Outlet BC was pressure outlet.

2) I tried fixing several head values by setting different pressure values at the inlet and outlet at a constant rpm. Inlet and outlet BCs are pressure outlet.

Finally I monitored pressures and velocities and none of my all simulations converged.

Any ideas about what is wrong? Or any recommendations about how to build the performance curve?

Regards
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Old   January 15, 2012, 08:54
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If you give more information about your model it is easier for people to answer. Maybe your underrelaxation factors are too high.
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Old   February 18, 2012, 09:10
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Quote:
Originally Posted by husker View Post
... and none of my all simulations converged.
How do you judge convergence?
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Old   February 20, 2012, 04:42
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Quote:
Originally Posted by husker View Post
Hi all,

...
2) I tried fixing several head values by setting different pressure values at the inlet and outlet at a constant rpm. Inlet and outlet BCs are pressure outlet.

Finally I monitored pressures and velocities and none of my all simulations converged.

...
Regards
My solutions converged with Mass Flow Inlet & Pressure Outlet BCs. But I can't simulate with two pressure boundaries. I set static pressure at the outlet to zero and fix total pressure at the inlet. Do you have any ideas?

Do you have any ideas?
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Old   February 20, 2012, 04:46
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By the way, I set total pressure by using Stagnation Inlet BC.
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