negative efficiency of centrifugal pump

AdhavRohit · December 24, 2013, 09:09

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.

ARohit · December 26, 2013, 00:22

please help somebody..

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

thanks from heart.. !!

ghorrocks · December 26, 2013, 05:18

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?

December 26, 2013, 00:22	Please help somebody..i am still sttuck.	#2
ARohit New Member Bitte56 Join Date: Mar 2013 Location: India Posts: 15 Rep Power: 13	please help somebody.. I tried every possibility.. changing mesh, boundary condition time step factor ... and what not... thanks from heart.. !!

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December 26, 2013, 05:18		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	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?