Keyur Kanade
Ansys Employee

When you import stl it is represented as facets in ICEMCFD. Please convert facets to faces and then you can split the face. Please go through help manual for more details 

The best way to get geometry from stl file is in SpaceClaim. Please check following video.

You can also think of Fluent Meshing which can work smoothly for STL files. 

Please check following videos

Fluent Meshing Watertight Workflow:



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