Reply To: Helical fin double pipe heat exchanger – Unexpected temperature contour (FLUENT)

[Essence]

Hello,

Use higher order discretization for higher accuracy and turn ON warped face gradient correction and High order term relaxation (if the case is steady). If you are referring to the shadow faces, then you don't need to worry. In CHT cases, Fluent will automatically create them. I believe you have no inflation layers in air domain. Please add them.

And why are you using mixed BC? You have set zero heat transfer coefficient. Any reason?