7.6.18.12.15. Optically_Thick

Syntax: Thermal Conductivity [{of} SpeciesName] = Optically_Thick (K = k | Beta_R = beta_r | N = n)
Scope: Aria Material
Summary: Thermal conductivity model for optically thick materials.
Description: $k = K + \frac{16 \sigma n^2}{3 \beta_r} T^3$

where $K$ , $\beta_R$ , and $n$ are the provided parameters, $\sigma$ the Stefan-Boltzmann constant, and $T$ the temperature.