Discontinuity due to Interior edge !!!
 

Hi guys,

I'm solving the energy equation on two solid zones with the same physical properties separated by an interior type edge. But, I'm observing a small but noticeable discontinuity in the solution at the interior edge which is obviously not correct !!! I'm not using a very fine mesh but I'm confused why is it happening ?
If I don't use an edge, the discontinuity will disappear, so it is because of the edge !! Does the interior edge play any role in the computations ?