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Hi,
I'd create a model to simulate the thermal contact resistance at the solid interface.
And found an interesting result: Heat flux calculated 0 at the same material solids' interface, and correct with different materials or add thermal contact resistance at the solids' interface.
The attached file created by Autodesk Simulation CFD 2015.
Kevin,
Yes this is the case. If you change the material name of one of those volumes you will see the flux reported there (i.e. have Steel and Steel1 even though both are the same material properties).