# Question about CFX-pre and CFX-post

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 October 14, 2012, 09:12 Question about CFX-pre and CFX-post #1 Senior Member   lnk Join Date: Feb 2011 Location: Switzerland Posts: 118 Rep Power: 6 Hi everyone, May I ask if there's a way to set the volumetric flow speed through a surface as the inlet boundary condition in CFX-pre? And is there a way to calculate the volumetric flow speed through a surface from CFX-post? Best regards and many thanks, lnk

 October 14, 2012, 18:05 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,665 Rep Power: 84 Use a velocity boudnary condition, and use some CEL expressions to convert a volume flow rate to the veloicty. To get the volume flow rate from an existing model use the function calculator in CFD-Post.

 October 17, 2012, 10:25 #3 New Member   ali Join Date: Feb 2011 Posts: 25 Rep Power: 6 if you have the inlet density you can use a mass flow inlet boundary

October 23, 2012, 08:11
#4
Senior Member

lnk
Join Date: Feb 2011
Location: Switzerland
Posts: 118
Rep Power: 6
Quote:
 Originally Posted by eng_norouzi if you have the inlet density you can use a mass flow inlet boundary
Yes. I have the inlet density. How to set mass flow as inlet boundary condition?

 October 23, 2012, 17:03 #5 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 471 Rep Power: 10 It is one of the options.

October 25, 2012, 17:26
#6
New Member

ali
Join Date: Feb 2011
Posts: 25
Rep Power: 6
Quote:
 Originally Posted by lnk Yes. I have the inlet density. How to set mass flow as inlet boundary condition?
select mass flow rate as inlet boundary and mass-flow-rate=volumetric-flow-rate*density or velocity=volumetric-flow-rate/inlet area
it's quiet easy! what is your problem?
In cfd post you can do it by defining an expression: mass flow average@inlet

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