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 lnk October 14, 2012 09:12

Question about CFX-pre and CFX-post

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

 ghorrocks October 14, 2012 18:05

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.

 eng_norouzi October 17, 2012 10:25

if you have the inlet density you can use a mass flow inlet boundary

 lnk October 23, 2012 08:11

Quote:
 Originally Posted by eng_norouzi (Post 387101) 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?

 singer1812 October 23, 2012 17:03

It is one of the options.

 eng_norouzi October 25, 2012 17:26

Quote:
 Originally Posted by lnk (Post 388112) 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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