[sk692]

Hi there

I am simulating flow in a centrifugal pump using MRF in fluent. But I am getting almost constant or rather increasing total head with increase in flow rate at constant RPM. However with increase in speed the total head increases i.e. I am getting a almost constant value at a particular speed irrespective of the flow rate.
I have tried all the BC combinations, I can think off. I have tried
- mass flow inlet and pressure outlet
- mass flow inlet and outflow
- pressure inlet ad pressure outlet

But the results are coming the same.

Can anyone shed some light on this problem.

Thanks a lot in advance.

[madhu]

I have not used fluent as of now but have some good experience in CFX for centrifugal pump simulation
check below parameters.

Boundary condition:
Inlet : Total Pressure (Atmospheric)
Outlet : Mass flow rate (kg/sec)

Domains
Rotating domain ( Impeller fluid region)
Stationary domain ( Casing)

Interface
Rotating to stationary with GGI connection with Frozen rotor interface

Check the direction of rotation and rotational axis of impeller.

These data may help u to cross check

thanks with Regards,
Madhu