Use the Thermal Connection, Nonlayered Shell multiphysics coupling () to define a continuity condition across an edge and a surface, shared surfaces 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 Nonlayered 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 Edges, Shared boundaries (default) and Facing boundaries.

Select Edges to define continuity from an edge of a shell to a surface of a domain.

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.

Using the Edges option, the edges for the shell interfaces and the boundaries from the domain interface 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 selections in the Boundary selection, Heat and Boundary selection, Shell sections above.

In the Shell Orientation and Position section, set the configuration of the shell with respect to the geometry boundary by defining the offset, either to Position — Top side on boundary, Midsurface on boundary, Bottom side on boundary, or User defined.

For User defined, enter a value or expression for the Relative midsurface offset. It is given as the ratio between the offset distance and half the thickness. A value of +1 means that the actual bottom surface is located on the meshed boundary, and a value of −1 means that the top surface is located on the meshed boundary. Values outside the range [-1,1] are also allowed.

Select Connected area defined by — Shell thickness (default), Selected boundaries, domain side, or Distance from shell midsurface. This parameter determines the connected area between the shell and the selected solid domain boundaries. The default is that a distance from the shell edge having the size of half the shell thickness in both perpendicular directions is connected.

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 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 whole selection, select the Manual control of selection option and edit the selection in the Boundary selection section above.

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 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 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.