Reply To: user defined function error

[Rob]

The error suggests the compilation stage failed, so look further up the text to see if there were any more errors, they should be in the transcript .trn file too. 

Phase domains are how we interact with the mixture, primary and (however many) secondary phases there are in the model. There are a few examples here, https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v241/en/flu_udf/flu_udf_MultiphaseDEFINE.html  I'd start with the phase interaction/transfer options.