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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › species gradient calculation UDF error — can’t find the function › Reply To: species gradient calculation UDF error — can’t find the function

January 8, 2025 at 10:08 am
Rob
Forum Moderator

Check you're retaining all data, using the TUI command. Fluent doesn't keep all of the gradient values between iterations for RAM/efficiency reasons. 

/solve/set/advanced/retain-temporary-solver-mem   

Also, try running an iteration/timestep before running the UDF commands, not all data is available following initialisation, and you are messing with scalar gradients!Â