On the compromise between accuracy and computational cost of non-gray global models for heat radiation in gas mixtures

Abstract

In this study the prediction accuracy of latest versions of FSK and SLW models (Rank correlated) and WSGG model is assessed at the limit of smallest computation cost. The results of these predictions are compared with the Line-by-Line benchmark calculations. One-dimensional decoupled radiation calculation is performed on a variety of case studies in order to investigate the limit of computational cost where the accuracy of FSK and SLW model are able to surpass WSGG. The subpar performance of RC-SLW at three quadrature points is addressed by optimizing model parameters. The possibility of using an approximated mixture database is also assessed where the RC-FSK model is able to yield satisfactory results with as low as four quadrature points. Regarding the utilization of approximated curves, again the method seems to be working slightly better with RC-FSK. The outcomes of this analysis may serve as guidance regarding the efficient implementation of FSK or SLW models in CFD codes.