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 ht.

In 2D and 1D axisymmetric components, set the Thickness dz, which is the thickness of the domain in the out-of-plane direction. The default value is 1 m.

In 1D components, set the Cross sectional area Ac and the Cross sectional perimeter Pc of the domain. Default values are 1 m2 and , respectively.

Set the Reference temperature Tref. It is used for the evaluation of the reference density ρref when the Heat Transfer interface is coupled through Nonisothermal Flow multiphysics coupling to a Fluid Flow interface with Compressibility set to Incompressible. It is also used in the definition of the reference enthalpy Href which is set to 0 J/kg at pref (1 atm) and Tref.

Click to select any of the following check boxes to activate the versions of the ht interface as described in Benefits of the Different Heat Transfer Interfaces:

Under the Heat Transfer section, 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.

Under the Heat Transfer section, 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 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. At first order, Lagrange and serendipity shape functions are the same.

The default shape functions used for the temperature are Quadratic Lagrange for the modeling of heat transfer in solids, and Linear for the modeling of heat transfer in fluids. See the description of each version of the physics interface for more details.

Whenever the Heat transfer in biological tissue check box under the Physical Model section is selected and a Thermal Damage subnode is added under Biological Tissue, you can choose the discretization level of the Damage tissue indicator shape function: Constant (the default), Linear, Quadratic, Cubic, Quartic, or Quintic.

When the Irreversible Transformation subfeature is added under a Solid node, you can choose the discretization level of the Irreversible transformation indicator shape function: Constant (the default), Linear, Quadratic, Cubic, Quartic, or Quintic.

The Heat Transfer 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.