Reply To: What is the procedure for exporting .iges file from Design modeler and importing .iges file in APDL?

[Aniket]

This is a documented behavior (https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v212/en/ref_cad/cadParasolid.html) for Parasolid file format, I think the same would be applicable for IGES too.
APDL is unitless it does not differentiate between the two units.
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v212/en/ref_cad/cadIGES.html
Now in case your model is created in DM, let's assume 1 mm^3 length block, is coming as 0.001 in APDL (notice I am not using any units here), and you want it to be 1 in APDL, simply scale your model in DM by 1000 and then export and then import the file in APDL.
If you are not ok with scaling your model, take it to Mechanical Model, mesh it there and then export the input file from there in required units:
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v212/en/wb_sim/ds_writing_reading_ansys_files.html
-Aniket
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