Looking at https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_udf/flu_udf_DataAccessMacros.html and https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_udf/flu_udf_sec_user_defined_scheme_var.html do you need that, or do you need the pressure on a surface to then do something?
The dynamic mesh example (reed valve) video might be useful? https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/prod_page.html?pn=Fluent&pid=Fluent&lang=en&prodver=23.1
You are navigating away from the AIS Discovery experience