pulse boundry condition

raminostadi · November 9, 2016, 04:05

Hello experts.
I am working on blood flow simulation in an artery

I have a series problem in inputing boundry condition in fluent.

my boundry condition is velocity inlet and pressure outlet ( depends on time and time period=0.75 s )

I know that udf function is my soloution but I don't know formula of my time-velocity and time-pressure at boundries for creating udf.

even, I use ''Table Curve'' for fiting data but I can't find formula because my bondry condition isn't sin or cos function. please help me.
I apploaded my boundry condition's charts.

outlet pressure.JPG

inlet velocity.JPG

Can any body help me? how can I imput boundry condition in fluent?

Can any body write udf for my boundry condition or give me some advice?

best regards.

ayousif00 · December 21, 2016, 04:20

Did you manage to solve this problem?

KevinZ09 · December 21, 2016, 07:32

If all you're trying to do is create a transient homogenoues inlet velocity and pressure outlet then I'd suggest using a profile file instead of a UDF. See chapter 6.6 of the Fluent manual for more information.

November 9, 2016, 04:05	pulse boundry condition	#1
raminostadi Member ramin Join Date: Jul 2016 Posts: 41 Rep Power: 10	Hello experts. I am working on blood flow simulation in an artery I have a series problem in inputing boundry condition in fluent. my boundry condition is velocity inlet and pressure outlet ( depends on time and time period=0.75 s ) I know that udf function is my soloution but I don't know formula of my time-velocity and time-pressure at boundries for creating udf. even, I use ''Table Curve'' for fiting data but I can't find formula because my bondry condition isn't sin or cos function. please help me. I apploaded my boundry condition's charts. outlet pressure.JPG inlet velocity.JPG Can any body help me? how can I imput boundry condition in fluent? Can any body write udf for my boundry condition or give me some advice? best regards.

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December 21, 2016, 04:20		#2
ayousif00 New Member Johanson Join Date: Jul 2016 Posts: 4 Rep Power: 10	Did you manage to solve this problem?

December 21, 2016, 07:32		#3
KevinZ09 Senior Member Kevin Join Date: Dec 2016 Posts: 138 Rep Power: 10	If all you're trying to do is create a transient homogenoues inlet velocity and pressure outlet then I'd suggest using a profile file instead of a UDF. See chapter 6.6 of the Fluent manual for more information.