Heat Source (Heat Transfer in Thin Shells Interface)
This node, available in 3D and 2D axisymmetric components only, models a point heat source (or sink).
Point Heat Source
Enter the Point heat source Qp in unit power. A positive Qp is heating and a negative Qp is cooling.
Heat Source Radius
Select the Specify heat source radius check box to define the Heat source radius R. This setting averages the source on a cylinder of a given radius around the line, and avoids getting an increasing temperature value at the line when meshing finer than this radius. It makes use of the diskavg operator for averaging around the source.
Frame Selection
This section is not available if the Specify heat source radius option is disabled. The settings are the same for the Heat Source node Frame Selection section
See Built-In Operators in the COMSOL Multiphysics Reference Manual for additional information about the diskavg operator.
You can specify the source to be a harmonic perturbation in a frequency domain analysis. To mark the source as being a harmonic perturbation, right-click the node and choose Harmonic Perturbation. Note that this updates the node’s icon. See Theory for Harmonic Heat Transfer for more details.
Theory for Heat Transfer in Thin Structures
Handling Frames in Heat Transfer
Location in User Interface
Context menus
 Heat Transfer in Thin Shells>Points>Heat Source
Ribbon
Physics Tab with Heat Transfer in Thin Shells selected:
Points>Heat Source