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boundary condition problem in centrifugal compressor

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Old   February 7, 2010, 05:40
Question boundary condition problem in centrifugal compressor
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jafar
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Hi evrybody
I'm doing a centrifugal compressor with vaned diffuser(operating in subsonic regime) simulation, using CFX. when I choose mass flow rate in outlet and static pressure in inlet boundary there is no problem and the results are acceptable, but when I choose pressure in outlet boundary, flow COMPLETELY reveresed in both inlet and outlet boundary. I've tried these conditions:
- changing pressure value
- changing angular velocity
- Opening boundary condition
- outlet average static pressure(average over whole outlet)
- setting mass flow target in rotor-stator interface
but there is no improvement
I appreciate any HELP
thanks.
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