Use the Thermal Connection, Layered Shell, Surfaces multiphysics coupling () to define a continuity condition across shared or facing surfaces, between a temperature field from a heat transfer in domain interface and a temperature field from a heat transfer in shell interface for which the Shell type is set to Layered shell.

Select the Heat transfer interface (any of the domain heat transfer interfaces) and Heat transfer in shells interface (any of the shell heat transfer interfaces) to couple.

First select the Connection type among Shared boundaries (default) and Facing boundaries.

Shared boundaries corresponds to configurations where the same boundaries are shared between the Heat transfer and the Heat transfer in shells interfaces. In case the physics interfaces are defined on different boundaries, for example in case of assemblies, select the Facing boundaries option.

When Shared boundaries is selected, the boundaries shared between the two physics interfaces are selected by default. In case the continuity condition should not be applied to the entire selection, select the Manual control of selections option and edit the selection in the Boundary Selection section above.

In the Layered shell boundary list select either Automatic, Top, or Bottom option to specify which side of the shell is connected to the solid. Automatic determines the side based on the boundaries normal vectors.

With the default option for Connection tolerance, Automatic, the tolerance Δ is set to 0.5% of the shell thickness, which allows for small inaccuracies on, for example, a curved geometry. By selecting User defined, you can modify the value of Δ.

When Facing boundaries is selected, select the boundaries from the domain interface in the Boundary Selection, Heat section and the ones from the shell interface in the Boundary Selection, Shell.

In the Layered shell boundary list select either Top or Bottom option to specify which side of the shell is connected to the solid.

With the default option for Connection tolerance, Automatic, the tolerance Δ is set to 0.5% of the shell thickness, which allows for small inaccuracies on, for example, a curved geometry. By selecting User defined, you can modify the value of Δ.

When Connection type is set to Facing boundaries the Advanced section is displayed. Select either Heat transfer in shells or Heat transfer (default) to define the boundaries where the continuity constraint is defined.

when Heat Transfer in Solids (or another version of the Heat Transfer interface) and Heat Transfer in Shells (or another version of the Heat Transfer shell interface) are present.