The Radiation in Absorbing-Scattering Media Interface is available in 2D, 2D axisymmetric, and 3D components to model the propagation, attenuation, and scattering of an incident light within a semitransparent material considered to be non-emitting.
The radiative intensity I(Ω) at a given position following the
Ω direction is the solution of the radiative transfer equation with no emission term (see
Ref. 22):
See Radiative Transfer Equation for details about the phase function,
.
If the Discrete Ordinates Method (DOM) is used for the approximation of
Equation 4-102,
G is computed as
If the P1 Approximation Theory is used instead,
G is the solution of the following equation,
where DP1 is the P1 diffusion coefficient and
ε the surface emissivity.