Robert Woolhouse
Ansys Employee

I'd start by figuring out how/why the mesh is so chewed up between the fins: check all sizing & inflation you've used in meshing as the size functions shouldn't produce a mesh like that. 


Surface data is easy: just use named selections to label up everything you want to post process so it's easy to find in the solver.  Do you want the temperature of the solid (makes sense) or fluid (not sure why)?