Use the Change Thickness (Out-of-Plane) node to set the out-of-plane thickness for specific geometric entities.
Enter a value or expression for the Out-of-plane thickness d (SIĀ unit: m). The default value is, in most cases, 1 unit length, which is typically not representative for a thin domain. Instead it describes a unit thickness that makes the 2D equation identical to the equation used for 3D components.