Multi-Group Full-Spectrum k-Distribution Database for Water Vapor Mixtures in Radiative Transfer Calculations

A thorough investigation of the absorption coefficient dependence on temperature and pressure has been performed for water vapor and a 32-group database has been assembled for H₂O mixtures at atmospheric pressure, based on the Multi-Group Full-Spectrum Correlated k-distribution model. The method is fully scalable, i.e., spectral groups from the database can be combined to obtain coarser group models (N = 1, 2, 4, …) for greater numerical efficiency (accompanied by slight loss in accuracy). The databases for CO₂ and H₂O, together with the random-overlap mixture model have been used to simulate a practical combustion problem.