Reply To: Need help in 6dof udf with a face loop

[Surya Deb]

Hello,
You f_thread seems undefined. You need to fetch the f_thread. You can use Lookup_Thread macro. check here [https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v211/en/flu_udf/flu_udf_sec_special_macros.html?q=lookup%20thread].
Also check your logic regarding the summation of the velocity.
Regards SD