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access node values in UDFs

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Old   February 7, 2011, 09:02
Default access node values in UDFs
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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.
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Old   February 7, 2011, 20:16
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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).

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Old   February 8, 2011, 03:12
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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.
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Old   February 8, 2011, 09:40
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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.

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Old   September 29, 2022, 11:16
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Quote:
Originally Posted by DoHander View Post
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
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