Even after using "Boundary Layer" on fem,"nx_adv_fluid_mod" and "nx_adv_fld_mod_solv" is not released and how to release these after its usage.
Solution
NX don't release license after command execution.
These license features ( or the tokens used to get access ) would be released when the Pre/Post application is exited. For E.g Switching to modeling application and then coming back to pre/post will work.
Notes