For 2d case, I have a circular region inside a rectangular box, how to assign boundary code at interface between two regions. Do I need to mesh them together or separately. Eventually the goal is to use the mesh in Open_Foam.
You can do them together but only in 2D, not 3D. What form is the input? If it's a .in2d file then see the documentation for the file format and it explains how to specify the different regions.
input file : stl format, does stl format will work?
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