# Inlet pressure profile for my project

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April 28, 2011, 06:09
Inlet pressure profile for my project
#1
Senior Member

Govindaraju
Join Date: Apr 2010
Posts: 206
Rep Power: 9
Dear all
Please find the attached pressure profile which I would like to give as an inlet boundary condition.

I need your help how to generate this kind of pulse wave form.

Is there any equation or function to generate this kind pulse wave form?

but I saw one reply from ghorrocks that ,"a user function with a 1D interpolation will do it easily"

I could not understand what is the userfunction. ghorrocks can you explain please?

Kindly help me

Regards
kmgraju
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 April 28, 2011, 06:58 #2 Senior Member   Lance Join Date: Mar 2009 Posts: 601 Rep Power: 13 Have a look at this example: http://www.edr.no/blogg/ansys_blogge...nsient_profile

 April 28, 2011, 10:58 #3 Senior Member   Govindaraju Join Date: Apr 2010 Posts: 206 Rep Power: 9 Dear Mr. Lance Yes what you are saying is correct. But how can we obtain the values for the inlet?. Is there any method available to get the values? Please help me Thank you Regards kmgraju

 April 28, 2011, 11:06 #4 Senior Member   Lance Join Date: Mar 2009 Posts: 601 Rep Power: 13 Um.... are you asking how to get the values from your graph to Excel? Look in the graph? Here, I'll even give you one to start with: Time [s] Pressure [mmHg] 0 85 ...or use some software like Windig (or similar) to extract the curve from the image.

March 21, 2012, 09:31
#5
New Member

krish
Join Date: Mar 2012
Posts: 1
Rep Power: 0
Quote:
 Originally Posted by Lance Have a look at this example: http://www.edr.no/blogg/ansys_blogge...nsient_profile
Sir,

I am beginner in CFD. Saw this example and started working on transient condition. The excel portion of more than 100 values looks laborious. Is there any other method involving table such that when the inlet is selected the values of x and z automatically appears?

 March 21, 2012, 17:43 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 You can copy/paste the numbers into the CCL code, or use a csv file for a 3D interpolation function.

 March 28, 2012, 18:45 #7 Member   Hesam Moghaddam Join Date: Mar 2012 Posts: 49 Rep Power: 6 Dear Krish, you can use Dagra software for extracting the data points out of you curve and export them into excel. It's so user friendly. Then follow the link about exporting excel data file into CFX for using as BC and you won't have any proble, I just did it now. Regards, Hesam

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