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Old   October 14, 2012, 09:12
Question Question about CFX-pre and CFX-post
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lnk
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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
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Old   October 14, 2012, 18:05
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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.
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Old   October 17, 2012, 10:25
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if you have the inlet density you can use a mass flow inlet boundary
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Old   October 23, 2012, 08:11
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Quote:
Originally Posted by eng_norouzi View Post
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?
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Old   October 23, 2012, 17:03
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It is one of the options.
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Old   October 25, 2012, 17:26
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Quote:
Originally Posted by lnk View Post
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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