Displaying on the interior domains isn't recommended as it's the default label for all cell facets so can cause the computer to crash as the graphics load becomes rather high. In this case it looks to show the blocks are cooling, albeit slowly. Look under the "New Surface" option to create iso-surfaces (of mesh) or planes to replicate the CFD Post image.
I'd only use Total Temperature for compressible systems, Static is usually sufficient.Â
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