Improved Wavenumber Selection Scheme for Line-by-Line Photon Monte Carlo Simulations in Combustion Systems

Recently, it has become possible to conduct line-by-line (LBL) accurate radiative heat transfer calculations in spectrally highly nongray combustion systems using the Monte Carlo method. LBL accuracy, in principle, adds little to the computational load as compared to gray calculations. However, when employing the Monte Carlo method, choosing appropriate emission wave numbers for statistical photon bundles can be numerically expensive. In this paper, a new scheme for wave number selection is proposed, significantly decreasing CPU requirements compared to previous work. The accuracy of the new method is established and its time requirements are compared against the previous method.