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negative efficiency of centrifugal pump

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Old   December 24, 2013, 09:09
Angry negative efficiency of centrifugal pump
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Rohit Adhav IIT Madras
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please help someone.

my simulation is converging without showing any reverse flow. but the result is

negative efficiency
negative head generated

flow rate is ok.
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Old   December 26, 2013, 00:22
Default Please help somebody..i am still sttuck.
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please help somebody..

I tried every possibility..
changing mesh,
boundary condition
time step factor ... and what not...

thanks from heart.. !!
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Old   December 26, 2013, 05:18
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Glenn Horrocks
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Are you sure you have the rotation and torque vectors defined correctly? And the flow set up correctly? Have you manually calculated the rotor torque and rotation to check it makes sense?
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ansys cfx13, convergence problem

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