# access node values in UDFs

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 February 7, 2011, 09:02 access node values in UDFs #1 Senior Member     Amir Join Date: May 2009 Location: Montreal, QC Posts: 735 Blog Entries: 1 Rep Power: 21 Dear friends, I want to access node velocity components of cells in domain by UDF, but it seems that such functions do not available ! am I right ? Any idea ? Thanks in advance.

 February 7, 2011, 20:16 #2 Senior Member   Real Name :) Join Date: Jan 2010 Location: United States Posts: 192 Rep Power: 14 Amir, I may be mistaken, but I believe most values are computed and stored at cell and face centroids, not node values (or, if they are, it's only temporarily stored). Regards, ComputerGuy

 February 8, 2011, 03:12 #3 Senior Member     Amir Join Date: May 2009 Location: Montreal, QC Posts: 735 Blog Entries: 1 Rep Power: 21 Thanks for your response, If you look at mem.h library file, you can find various functions than can retrieve node values e.g. node velocity like NODE_VELOCITY and etc. But their values are not reasonable.

 February 8, 2011, 09:40 #4 Senior Member   Join Date: Nov 2009 Posts: 411 Rep Power: 18 A possible solution, just an idea, will be to get the values at the cell centers surrounding a node and then you can interpolate the value at the node. There a few interpolation formulas for this, one developed by Frink is based on the inverse distance from the node to the surrounding cells center of gravity. Do

September 29, 2022, 11:16
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Yuefan Zhang
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Quote:
 Originally Posted by DoHander A possible solution, just an idea, will be to get the values at the cell centers surrounding a node and then you can interpolate the value at the node. There a few interpolation formulas for this, one developed by Frink is based on the inverse distance from the node to the surrounding cells center of gravity. Do

Hello sir! Is there any specific method,if I interpolate the pressure of the cytoplasm around the node to get the pressure of the node? I really want to know how to do it step by step. Besides, where can I get the interpolation formula developed by Frink. Thanks a lot.

Yours sincerely