Deposited Beam Power
This node models heat sources brought by narrow beams, such as laser or electron beams, to a given boundary.
Beam Orientation
Enter a value for the Beam orientation e. This vector does not need to be normalized. In 2D axisymmetric components, it is aligned with the z-axis.
Beam Profile
Either select an option for the Beam profile among the Built-in beam profiles, or set the it as User defined by entering a value for the Beam power density, I0 (SI unit: W/m2). The Beam power density corresponds to the beam intensity in the beam cross section.
For Built-in beam profiles, enter a value for the Deposited beam power P0 and the coordinates of the Beam origin point O.
Then, select a Distribution type: Gaussian (default) or Top-hat disk.
For Gaussian, enter the Standard deviation σ.
For Top-hat disk, enter the Beam radius R. Smoothing can be applied by entering a positive Size of transition zone ΔR. The default value of 0 m corresponds to an ideal discontinuous top-hat profile.
Source Position
To display this section click the Show More Options button () and select Advanced Physics Options.
Select a Source position to define a side where the heat source is defined: Layer (default), Upside, or Downside. This setting has no effect unless the temperature differs from one side of the boundary to the other.
Upside and downside settings can be visualized by plotting the global normal vector (nx, ny, nz), that always points from downside to upside. Note that the normal vector (ht.nx, ht.ny, ht.nz) may be oriented differently.
See Tangent and Normal Variables in the COMSOL Multiphysics Reference Manual.
Location in User Interface
Context Menus
Ribbon
Physics tab with interface as Heat Transfer in Solids and Fluids, or any version of the Heat Transfer interface selected:
Physics tab with Porous Medium>Fluid or Porous Medium>Porous Matrix selected in the model tree: