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  3. F_C0 returning -1 in Fluent UDF

F_C0 returning -1 in Fluent UDF

    • June 20, 2025 at 5:56 pm
      balevy
      Subscriber

      I have a UDF where I loop over the cells in a thread and then the faces of each cell. I use F_C0() and F_C1() to get the cells on either side of the face. However, sometimes, F_C0() returns -1, which seems like it corresponds to C0 not existing. When this happens, F_C1 works without issue (and corresponds to the current cell in my outer cell loop). Does anyone know what is happening in this case?

      I also make sure that the face is not on a boundary using BOUNDARY_FACE_THREAD_P(), so both C0 and C1 should exist.

      I am using Fluent 2023R2.

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