The convective boundary condition can be entered directly in the Ansys Fluent. It is available in the Fluent thus there is no need to write an expression or udf.
Have a look at this: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/flu_ug/flu_ug_bcs_sec_bound_cond.html
If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/using-help-with-links/#latest
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