[mohamed shawky]

hi every body
i try to solve simple problem flow inside tube but it have thickness 2mm so i draw two parts with two body and convert them to one part(assembly) as tutrial conjecated heat transfer. but in this tutorial after solving the heat flux at any point in (Domain Interface 1 Side 1 OR Domain Interface 1 Side 2) is exactly the same .
but,in my problem not the same and by mind this two interfaces is one surface so the heat flux must be the same

what is the error?!!!!!!