dear Rob, thank you for your reply.
as I know the mesh interfaces appear when there are interfaces between domains and this will lead to conjugated heat transfer. However, I made all bodies as one part in the design modeler and made share topology for that part. So, I suppose that I have conjugated heat transfer.
Air properties are defined by Ansys fluent, I didn’t make any changes.
I have one value of heat flux which is applied on the top surface of absorber domain.
the temperature contour for all domains at a plane located at the inlet and outlet is the same (i.e. there are no differences between the two contours):
the temperature contour at a plane located nearly in the center of the air domain:
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