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How to generate STL files for idealized geometries?

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Old   November 1, 2012, 13:47
Default How to generate STL files for idealized geometries?
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This is probably a newbie question...
I want to generate STL files for some idealized geometries, like straight tube, elbow, Y bifurcation in order to use them for a CFD simulation. The stl files should describe geometries with different parts (wall, inlets and outlets).

Which software is best suited to generate such stl files (ideally an open-sorce software). I also have an ICEM CFD license...can I use ICEM CFD to generate stl files? I couldn't find anything in the ICEM CFD tutorials...

Thanks a lot!
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