How does one employ ANSYS Fluent for fluid recycling simulation
 

How is ANSYS Fluent utilized for simulating fluid recycling, and what are the procedures for setting up boundary conditions to enable the recirculation of fluid from the outlet to the inlet?

Off the top of my head, there's probably a couple ways:

- Export the concentration at the outlet to a boundary profile (.prof) and read these in as the inlet condition. Can probably done with some hacky "execute commands" or the right TUI commands in a journal.

- Use a UDF which loops over the outlet faces and extracts the required properties, probably writing out to a file (unless the inlet and outlet have the same cell count or are symmetrical), read these in and apply with a DEFINE_PROFILE UDF.