Solid Edge STL surface export




I'm in situation where I need to export surfaces from 3D solid to STL files.

More accurately I need to divide 3D models surfaces to different STL files.


STL files are for CFD.

Simple example is straight solid tube, I need to extract 3 different surfaces from it:

Outer wall: surface of cylinder.

Inlet: first end of tube.

Outlet: second end of tube.


All these has to imported as single STL surfaces to induvitual files.



How this could be done?

If not possible with solid edge, any opensource or free tool chain advailable to do this?