An approach is proposed to improve numerical modeling of directional thermal radiation originating from absorbing, emitting and scattering media. In this approach, the finite volume method for radiation transfer is applied on the narrow-band basis to evaluate the source function of the radiative transfer equation. The emission in a given direction is then predicted through integration of the transfer equation with evaluated source functions along lines-of-sight through the medium. The correlated-k model is coupled with the radiative transfer solvers to ensure accurate spectral modeling of gas radiative properties. The method performance is demonstrated by comparison with solutions obtained using the basic finite volume method with various directional discretizations. This comparison was done for infrared radiation from a participating medium contained in a three-dimensional enclosure.
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