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 Deposited beam power density, Qb (SI unit: W/m2).
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 (the default) or Top-hat disk.
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For Gaussian, enter the Standard deviation σ.
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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 button () and select Advanced Physics Options.
Select a Source position to define a side where the heat source is defined: Layer (the default), Upside, or Downside. This setting has no effect unless the temperature differs from one side of the boundary to the other.
The standard deviation of the Gaussian distribution and the radius of the top-hat distribution can take values smaller than the mesh element size. For more accurate results, it is important to refine the mesh enough at the deposited heat source location. Otherwise, an automatic substitution replaces the standard deviation σ or the beam radius R by the minimum length to get acceptable results which depends on the mesh element size.
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
 Heat Transfer>Deposited Beam Power
Heat Transfer in Solids>Deposited Beam Power
Heat Transfer in Fluids>Deposited Beam Power
Heat Transfer in Porous Media>Deposited Beam Power
Bioheat Transfer>Deposited Beam Power
Ribbon
Physics Tab with interface as Heat Transfer, Heat Transfer in Solids, Heat Transfer in Fluids, Heat Transfer in Porous Media, Heat Transfer in Building Materials or Bioheat Transfer selected:
Boundaries>interface>Deposited Beam Power