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Old   September 24, 2010, 14:54
Default Cel or UDF
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I am trying to do a reaction simulation and I need to enter an expression with a derivative term. Can I do this using cel or I need to use a udf with fortran?
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Old   September 24, 2010, 16:29
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In older versions (10.0 and below) CEL does not have gradient or derivative operators. Exception: if CFX defines a derivative or gradient as variable it can be used.

Do not know if this holds true for recent versions. If yes you have to use User Fortran.

UDF is Fluent.
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