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  3. Derivatives of custom field function in Fluent

Derivatives of custom field function in Fluent

    • May 16, 2025 at 9:02 pm
      scabo
      Subscriber

      Hi

      I have defined a custom field func in Fluent. Can someone please let me know how to calculate the derivative of a custom field function in Fluent?

      thanks

    • May 19, 2025 at 12:41 pm
      Rob
      Forum Moderator

      It doesn't look like there's a function in the CFFs. The more usual approach is to use a UDF, and one of UDS or UDM has a gradient function available there. 

    • May 20, 2025 at 11:36 pm
      scabo
      Subscriber

      Hi

      I want to calculate the first/second derivative of Re stress terms. So how will I proceed? I am unclear on how to use the UDF to calcualte the derivative? any suggestions is helpful.

      thanks

    • May 21, 2025 at 10:36 am
      Rob
      Forum Moderator

      There may be a function for that in the headers, have a look in https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v242/en/flu_udf/flu_udf_DataAccessMacros.html%23flu_udf_udf_cellvar for Derivative Macros and see what hints there are. 

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