Inlet pressure profile for my project

kmgraju · April 28, 2011, 06:09

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
Thanks in advance

Regards
kmgraju

Lance · April 28, 2011, 06:58

Have a look at this example:

http://www.edr.no/blogg/ansys_blogge...nsient_profile

kmgraju · April 28, 2011, 10:58

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

Lance · April 28, 2011, 11:06

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.

krish@11 · March 21, 2012, 08:31

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?
please help me

ghorrocks · March 21, 2012, 16:43

You can copy/paste the numbers into the CCL code, or use a csv file for a 3D interpolation function.

hesamking · March 28, 2012, 18:45

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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April 28, 2011, 06:58		#2
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	Have a look at this example: http://www.edr.no/blogg/ansys_blogge...nsient_profile

April 28, 2011, 10:58		#3
kmgraju Senior Member Govindaraju Join Date: Apr 2010 Posts: 209 Rep Power: 17	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
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	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, 16:43		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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
hesamking Member Hesam Moghaddam Join Date: Mar 2012 Posts: 49 Rep Power: 14	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