hot oil flows through center with cold surrounding water flowing in opposite direction. The outer shell has negligble thickness with the inner tube having an 0.002m thickness. I have attatched the diagram to give an idea of the simulation.
It's a conjugate heat transfer problem. You may use the coupled boundary condition for the interface.
https://www.cfd-online.com/Forums/fluent/167518-conjugate-heat-transfer-problem-coupled-boundary-condition.html
https://www.youtube.com/watch?v=u7x-s0Ud7xU
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