Hi,
I have been trying to run a heat transfer simulation on a 2D geometry made using a CAD program, stored as a .stl file. According to the PDE toolbox documentation, it should be possible to import a geometry from .stl for PDE modelling using the function 'importGeometry'. Indeed, importing the file works fine, it consists of a rectangle with several parts inside, each with different thermal properties. Plotting it with 'pdegplot' shows the geometry as it would be expected to look.
However, Matlab does not seem to recognize all the parts as belonging to the same geometry. For example, specifying a temperature on the boundary of the rectangle will result in a heat flow propagating through the rectangle, but ignoring all the parts inside, passing straight through them without feeling the different thermal properties. Specifing boundary conditions along the edges of these subdomains results in a heat flow propagating into these parts, but not to the surrounding area.
Upon closer inspection, I can see that a different mesh is generated for each subdomain. It seems like all the different shapes in the original .stl file are seen as different, independent geometries. Is there any way to import the .stl file, and make matlab see it as a whole, with subdomains of different properties?
