HTC on two sides wall
 

Hello everyone,
Can somebody please explain me how Fluent solve heat trsnsfer problem on coupled wall. For example I am modeling fluid flow around cylinder with energy source in it. I don understand how fluent calculate heat transfer coefficient between fluid and solid. I read that coupling wall means that heat flux is the same on boundary and its shadow zone.

The heat flux on both sides of the interface is the same on the coupled wall (via energy balance). On the fluid side, the energy transport equation is solved for temperature/energy. On the solid side, the heat equation is solved for temperature/energy. Eventually you can get a heat flux.

It's similar to solving the flow around a cylinder with a heat flux boundary condition, except that the heat flux is now a free variable and not a fixed value.

Heat transfer coefficient is a post-processed quantity that is calculated after-the-fact using the heat flux.

Thank you very much for your replay. Does it mean that solver calculate temperature values in every cell from these two equation (transport energy equation for fluid and heat equation for solid)?