Extract surfaces from stl when importing

Hi everyone,

I am doing a project for the subject of aerodynamics and I am using AcuConsole for that.

I am finding some problems with the CATIA reader I have installed with AcuConsole, so I am thinking now switching the file format to stl (seems more reliable).

The problem I am finding now is that I cannot split the model into different surfaces, to assign the airfoil, the sides, etc.

I tried to divide the geometry with the feature angle, changing it from 90 degrees to 0.1 and doesn't allow me to pick up any geometry when I create a new surface group.

Could you help me to solve that problem?

I attached the files if anyone wants to try. 

Thank you beforehand.

Guillermo

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