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Old   July 10, 2011, 02:30
Default Transient flow
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Govindaraju
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Dear all
My inlet is pulsatile pressure . since the inlet is pulsatile , I would like to introduce average mass flow rate at the outlet.

How to set average mass flow rate at the outlet as boundary condition

Thank you
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Old   July 10, 2011, 06:35
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Glenn Horrocks
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What feature do you have to absorb the pulses? Is it compressible flow? Free surface? FSI?
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Old   July 10, 2011, 20:40
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Quote:
Originally Posted by ghorrocks View Post
What feature do you have to absorb the pulses? Is it compressible flow? Free surface? FSI?
Dear

the flow is incompressible.I have a plan to do FSI as well . Thank you
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Old   July 11, 2011, 06:30
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If you do not know what the average flow rate is then you probably should not use it as a boundary condition. In this case you probably know better what the pressure is, so use a pressure boundary instead.
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Old   July 11, 2011, 11:39
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Quote:
Originally Posted by ghorrocks View Post
If you do not know what the average flow rate is then you probably should not use it as a boundary condition. In this case you probably know better what the pressure is, so use a pressure boundary instead.
Dear friend

The average flow is the variable at the outlet . so I may vary the flow . If the inlet pressure is pulsatile , The flow is also a pulsatile nature . Am I correct? if this is correct , I want to give average flow over the area . How to set up this boundary condition for this at the outlet ?

Thank you


Regards

Govind
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Old   July 11, 2011, 19:16
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If you know the average flow then simply assign the exit to be a flow rate boundary with the average flow.

Be very careful that you have properly specified the boundary conditions. I recommend you read the CFX documentation on boundary condition specification to make sure you are heading in the right direction.
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