Please explain step by step. Is Named Selection a problem or poly conversion?
If you have a volume meshing already generated then use File - Read in Fluent Meshing to read that file. Then check if Named Selections are coming or not.
For converting tet to poly, you will need to use Fluent solver.
But instead of poly conversion in Fluent, I will recommend you to generate poly in Fluent Meshing and then proceed.
Please go through help manual for more details
Regards,
Keyur
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