Discrete Data As Boundary Condition in CFX-Pre

ashtonJ · November 10, 2011, 21:22

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, 00:33

Use a 1D interpolation function.

ashtonJ · November 11, 2011, 23:20

Quote:

Originally Posted by ghorrocks

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, 17:03

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

ashtonJ · November 13, 2011, 20:46

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, 05:16

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

November 10, 2011, 21:22	Discrete Data As Boundary Condition in CFX-Pre	#1
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 16	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

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November 11, 2011, 00:33		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	Use a 1D interpolation function.

November 13, 2011, 17:03		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	Coordinate? Then you used a 3D interpolation function. You need a 1D interpolation function.

November 13, 2011, 20:46		#5
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 16	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

November 14, 2011, 05:16		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	I see. In your case you define pressure as the result unit and time as the argument units. Then your coordinates are (time, pressure).