The Label is the default physics interface name.

The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.

The default Name (for the first physics interface in the model) is htlsh.

Select the applicable layers (the default setting is All layered materials). If no layered materials have been included yet, there is a shorthand available for creating a Single Layer Material, a Layered Material Link, or a Layered Material Stack (the plus, next to the Layer Selection setting).

For 2D components, define the Out-of-plane thickness dz (SI unit: m) (see Equation 4-50). The default is 1 m.

Select the Heat Transfer in Porous Media check box to enable the Porous Medium feature for the modeling of porous media. This check box is selected by default in The Heat Transfer in Fractures Interface.

The Streamline diffusion check box is selected by default and should remain selected for optimal performance for heat transfer in fluids or other applications that include a convective or translational term. Crosswind diffusion provides extra diffusion in regions with sharp gradients. The added diffusion is orthogonal to the streamlines, so streamline diffusion and crosswind diffusion can be used simultaneously. The Crosswind diffusion check box is also selected by default.

The Isotropic diffusion check box is not selected by default.

To display all settings available in this section, click the Show button () and select Advanced Physics Options. You can choose the type and order of the shape functions used for the variables solved by the Heat Transfer in Shells interfaces.

For the temperature, you can choose not only the order of the discretization, but also the type of shape functions: Lagrange or serendipity. For highly distorted elements, Lagrange shape functions provide better accuracy than serendipity shape functions of the same order. The serendipity shape functions will however give significant reductions of the model size for a given mesh containing hexahedral, prism, or quadrilateral elements.

The shape functions used for the temperature are Quadratic Lagrange for the modeling of heat transfer in shells, and Linear for the modeling of heat transfer in films and heat transfer in fractures.

The Heat Transfer in Shells interfaces have the dependent variable Temperature T. The dependent variable names can be changed. Editing the name of a scalar dependent variable changes both its field name and the dependent variable name. If a new field name coincides with the name of another field of the same type, the fields share degrees of freedom and dependent variable names. A new field name must not coincide with the name of a field of another type or with a component name belonging to some other field.