Cross Section
Use this node with 1D components to model domains with another cross sectional area or another cross sectional perimeter than the global one that is used in the Heat Transfer interface Physical Model section. In 1D geometries, the temperature is assumed to be constant in the radial direction, and the heat equation is modified to take that into account. See Equation 4-180 and Equation 4-181.
Cross Section
Enter values for the Cross sectional area Ac and the Cross sectional perimeter Pc to set the cross section of the domain in the plane perpendicular to the 1D geometry.
The Cross Section feature is disabled when at least one of the multiphysics couplings (Heat Transfer with Surface-to-Surface Radiation, Heat Transfer with Radiation in Participating Media, Heat Transfer with Radiative Beam in Absorbing Media) is active while solving on the same domain. This is noticed through a warning node displayed under Compile Equations. The radiation interfaces assume an infinite medium in the out-of-plane direction, they are thus not compatible with these features.
Out-of-Plane Heat Transfer
Location in User Interface
Context Menus
 Heat Transfer in Solids and Fluids>Cross Section
Heat Transfer in Solids>Cross Section
Heat Transfer in Fluids>Cross Section
Heat Transfer in Porous Media>Cross Section
Heat Transfer in Building Materials>Cross Section
Bioheat Transfer>Cross Section
Ribbon
Physics tab with interface as Heat Transfer in Solids and Fluids, Heat Transfer in Solids, Heat Transfer in Fluids, Heat Transfer in Porous Media or Bioheat Transfer selected:
Domains>interface>Cross Section