# Transient flow

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 July 10, 2011, 02:30 Transient flow #1 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 207 Rep Power: 10 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

 July 10, 2011, 06:35 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,874 Rep Power: 107 What feature do you have to absorb the pulses? Is it compressible flow? Free surface? FSI?

July 10, 2011, 20:40
#3
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Govindaraju
Join Date: Apr 2010
Posts: 207
Rep Power: 10
Quote:
 Originally Posted by ghorrocks 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

 July 11, 2011, 06:30 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,874 Rep Power: 107 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.

July 11, 2011, 11:39
transient flow
#5
Senior Member

Govindaraju
Join Date: Apr 2010
Posts: 207
Rep Power: 10
Quote:
 Originally Posted by ghorrocks 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

 July 11, 2011, 19:16 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,874 Rep Power: 107 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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