As support we do not debug UDFs. But can provide help on particular syntex. Please check following link for details of UDF. Also if you have any subsequent questions, please post it on Ansys Forum Ansys Learning Forum under specific category.
Chapter 1: Overview of User-Defined Functions (UDFs) (ansys.com)
How to access Ansys Online Help Document
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Fluids Engineering Courses | Ansys Innovation Courses
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