Rob
Ansys Employee
Interior is correct, and that is unlikely to be causing the problem. nWhenever a model fails with UDFs the first step is to remove the UDF. Patch a temperature in and use a fixed time step. You also need to review the error in Fluent as that'll be more diagnostic. Once we know the mesh & solver settings are OK use the UDF patch function and run and finally reapply the time stepping method you've designed. nFor info, a UDF can return no errors as it's grammatically correct but still cause the solver to fail either through omission (data is missing) or by producing values that cause instability in the code. n
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