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 m
2 and 1 m, respectively.
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.
Add both a Heat Transfer (ht) and a
Moving Mesh (ale) interface (found under the
Mathematics>Deformed Mesh branch when adding a physics interface) then click the
Show More Options button (
) and select
Advanced Physics Options in the
Show More Options dialog box to display this section.
When the component contains a moving mesh, the Enable conversions between material and spatial frame check box is selected by default. This option has no effect when the component does not contain a moving frame because the material and spatial frames are identical in such cases. With a moving mesh, and when this option is active, the heat transfer features automatically account for deformation effects on heat transfer properties. In particular the effects of volume changes on the density are considered. Rotation effects on the thermal conductivity of an anisotropic material and, more generally, deformation effects on an arbitrary thermal conductivity, are also covered. When the
Enable conversions between material and spatial frame check box is not selected, the feature inputs (for example,
Heat Source,
Heat Flux,
Boundary Heat Source, and
Line Heat Source are not converted and are instead defined in the
Spatial frame.
The shape functions used for the temperature are Quadratic Lagrange for the modeling of heat transfer in solids,
Linear for the modeling of heat transfer in fluids. To display more than the shape functions in this section, click the
Show More Options button (
) and select
Advanced Physics Options in the
Show More Options dialog box. See the description of each version of the physics interface for more details.
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.
