COMSOL 6.4 - Interfaces and Features for Radiation in Participating Media

Interfaces and Features for Radiation in Participating Media

The following table recalls the functionalities available for the modeling of radiative heat transfer in participating media.

Table 3-16: Modeling of Heat Transfer by Radiation.
	Absorbing Media	Absorbing–Scattering Media	Participating Media
Description
Physical and modeling assumptions
Refractive index of domain	Any, uniform	Any, uniform	Any, uniform
Scattering in domain	N/A	Isotropic (P1 method, DOM) Linear anisotropic (P1 method, DOM) Anisotropic (DOM) Henyey–Greenstein (DOM)	Isotropic (Rosseland approximation,P1 method, DOM) Linear anisotropic (P1 method, DOM) Anisotropic (DOM) Henyey–Greenstein (DOM)
Wavelength dependency of emissivity	No	Yes (Solar and ambient / Multiple spectral bands) No (Constant)	Yes (Solar and ambient / Multiple spectral bands / Weighted Sum of Gray Gases Model) No (Constant)
Dimension of the domain	3D, 2D axi, 2D	3D, 2D axi, 2D	3D, 2D axi, 2D
Example model	N/A	N/A	Glass Plate
License, interfaces and features
License requirement	Heat Transfer Module	Heat Transfer Module	Heat Transfer Module
Interfaces	Radiative Beam in Absorbing Media (rbam)	Radiation in Absorbing–Scattering Media (rasm)	Radiation in Participating Media (rpm) Heat Transfer (ht): Rosseland approximation
Domain features	Absorbing Medium, Initial Values	Absorbing–Scattering Medium, Initial Values, Radiative Source	Participating Medium, Initial Values, Radiative Source Optically Thick Participating Medium
Boundary features	Opaque Surface Incident Intensity Transparent Surface	Opaque Surface Semitransparent Surface (DOM) Incident Intensity Continuity of Interior Boundary (DOM) Periodic Condition Symmetry	Opaque Surface Semitransparent Surface (DOM) Incident Intensity Continuity of Interior Boundary (DOM) Periodic Condition Symmetry
Multiphysics features	Heat Transfer with Radiative Beam in Absorbing Media (htrbam)	Heat Transfer with Radiation in Absorbing–Scattering Media (htrasm)	Heat Transfer with Radiation in Participating Media (htrpm)
Numerical aspects
Numerical cost	Medium	Medium (P1 method) High (DOM)	Low (Rosseland approximation) Medium (P1 method) High (DOM)
Radiation variables	Incident intensities Ii	Incident radiation G (P1 method) Radiative intensity I=I1,..., In, with n up to 512 (DOM)	None (Rosseland approximation) Incident radiation G (P1 method) Radiative intensity I=I1,..., In, with n up to 512 (DOM)