Reply To: Forced Convection

[Rob]

OK, I think I know what's going on. You didn't do share topology in the geometry tool (SpaceClaim), so have a nonconformal mesh. In itself that's OK (not ideal, but OK) but you've then added a wall heat flux to the connecting wall. If you're lucky the solid is warming up, but most likely nothing is getting warm. 

The safest fix is to go back to the geometry step and ensure you've shared topology: that'll be covered in the tutorials and/or course on Learning. Mesh the geometry, please review the course/tutorials there too for some guidance.

In Fluent you need to decide where the heat is coming from. Ie is the whole solid hot (eg a computer chip) or is just one wall heated? The former is a source term, the latter a wall boundary condition (as you set in the above case). However... now you fixed the geometry you'll have a few wall & wall:shadow pairs (coupled walls) do NOT change that coupled setting without understanding what it does: it's covered in the Fluent User's Guide.