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  3. Source term derivative in Fluent UDF DEFINE_SOURCE(MOMENTUM, c, t, dS, eqn)

Source term derivative in Fluent UDF DEFINE_SOURCE(MOMENTUM, c, t, dS, eqn)

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    • July 16, 2024 at 6:55 pm
      Asif Shahriar Nafi
      Subscriber

      Hi

      I have a question regarding the derivative of the source term in DEFINE_SOURCE macro.

      Is derivative mandatory in the macro? As far I know, it is for solver stability. I noticed that when I do not provide dS[eqn] in the UDF, it still works and nothing changes. 

      My source term is a very big equation and the derivative itself is basically 100 lines of extra code. Is it a must that I include derivative?

    • July 17, 2024 at 10:18 am
      Rob
      Forum Moderator

      It tends to help, but isn't required. dS[eqn] = 0.  is used in a few of the examples. 

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