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-   -   Discrete Data As Boundary Condition in CFX-Pre (https://www.cfd-online.com/Forums/cfx/94279-discrete-data-boundary-condition-cfx-pre.html)

 ashtonJ November 10, 2011 22:22

Discrete Data As Boundary Condition in CFX-Pre

Hi all,

I have following discrete data of time dependent pressure distribution and I want to impose these discrete data as inlet boundary condition in CFX-Pre. I would be too pleased if anybody help me to do that.

Time Pressure
016.54770.0117.88940.0219.67840.0322.8090.0429.51760.0538.46230.0645.17090.0746.95980.0848.74870.0950.53770.152.7739

Thank you very much.
AshtonJ

 ghorrocks November 11, 2011 01:33

Use a 1D interpolation function.

 ashtonJ November 12, 2011 00:20

Quote:
 Originally Posted by ghorrocks (Post 331663) Use a 1D interpolation function.
Thanks for your kind reply. I tried to use 1D interpolation function, however, I was asked to enter the coordinate for each pressure value. I'd like to let you know that I have average pressure at each time interval. I mean, at different times, I have pressure values (a time dependent distribution) and don't have the coordinate. Please let me know what the coordinate is for my problem.
Thank you very much
AshtonJ

 ghorrocks November 13, 2011 18:03

Coordinate? Then you used a 3D interpolation function. You need a 1D interpolation function.

 ashtonJ November 13, 2011 21:46

http://imageshack.us/photo/my-images...nfunction.jpg/http://imageshack.us/photo/my-images/528/mydata.jpg/

Image1 URL: http://imageshack.us/photo/my-images...nfunction.jpg/
Image2 URL: http://imageshack.us/photo/my-images/528/mydata.jpg/
Again thanks for your attention. I attached an image(1D interpolation Funcation.jpg) which shows that for 1D function, I need to specify the coordinate of each value. My data is also attached as an image. Please have a look and let me know how I can use the attached data as BC.

Thank you very much
AshtonJ

 ghorrocks November 14, 2011 06:16

I see. In your case you define pressure as the result unit and time as the argument units. Then your coordinates are (time, pressure).

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