We will view the temperature of the fluid and solid regions as the solution develops. Start by creating a new plane section part for display.
A new interactive in-place dialog, Create Section, will appear on top of the Graphics window to allow definition of the derived part.

This will activate the Select Objects dialog.

(1,0,0) and activate the plane tool option to update the origin values by ticking its checkbox.

In the object tree, a new node will appear within the Derived Parts node: plane section.

The plane section part can now be added to any suitable scene or be displayed in its own scene if desired. We will create a new scalar scene and display the plane section and other parts colored by the temperature scalar value.
The Scalar Scene 1 display will appear. Adjust the view so that it looks approximately as shown below.




Look at the Scalar Scene 1 display to verify that it contains the thermal insulator geometry along with a blue color bar for temperature.
