Absorbing Medium (Radiative Beam in Absorbing Medium Interface)
This node computes the radiative intensity of incident beams propagating in an absorbing medium, as the solution of the Beer-Lambert equation:
where
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 ei is the orientation of the ith beam (dimensionless).
•
 Ii is the intensity of the ith beam (SI unit: W/m2).
•
 κ is the absorption coefficient (SI unit: m–1) of the medium.
The energy deposited due to the propagation of the beams in the absorbing medium is computed and the radiative heat source term Q (SI unit: W/m3) is defined by:
See Incident Intensity (Radiative Beam in Absorbing Medium Interface) for the definition of the orientation and profile of the ith beam.
Model Input
This section has fields and values that are inputs to expressions that define material properties. If such user-defined property groups are added, the model inputs appear here.
Temperature
This section is available when temperature-dependent material properties are used. The default Temperature is User defined. When additional physics interfaces are added to the model, the temperature variables defined by these physics interfaces can also be selected from the list. The Common model input option corresponds to the minput.T variable, set to 293.15 K by default) and all temperature variables from the physics interfaces included in the model. To edit the minput.T variable, click the Go to Source button (), and in the Default Model Inputs node under Global Definitions, set a value for the Temperature in the Expression for remaining selection section.
Absorbing Medium
The Absorption coefficient of the medium, κ (SI unit: m–1), should be set in this section.
Radiative Beam in Absorbing Media Theory
Location in User Interface
Context Menus
 Radiative Beam in Absorbing Media>Absorbing Medium
Ribbon
Physics Tab with Radiative Beam in Absorbing Media selected:
Domains>Absorbing Medium