Application of the statistical narrow-band correlated-k method to low-resolution spectral intensity and radiative heat transfer calculations - effects of the quadrature scheme

The statistical narrow-band correlated-k method was employed to calculate l ow-resolution spectral intensity along a line-of-sight, and radiative heat transfer in both, a one-dimensional parallel-plates enclosure and a three-d imensional rectangular enclosure containing CO2-H2O-N-2 mixtures under vari ous conditions. Numerical calculations were conducted using six quadrature schemes: the commonly used "7-point Gauss-Lobatto" quadrature, the 4-point, 2-point, and I-point Gauss-Legendre quadratures, and the 4-point and 5-poi nt Gauss-Lobatto quadratures, The "7-point Gauss-Lobatto" quadrature yields very accurate results compared to the results of the statistical narrow-ba nd model. Results of the 4-point Gauss-Legendre quadrature are only slightl y less accurate than those of the "7-point Gauss-Lobatto" quadrature. The a -point Gauss-Legendre quadrature offers acceptably good accuracy with much less computing efforts, especially for calculations of spectrally integrate d quantities, Results of the 1-point Gauss-Legendre are in serious error. T he overall performance of the 4-point and 5-point Gauss-Lobatto quadratures is even worse than that of the 2-point Gauss-Legendre quadrature. Crown Co pyright (C) 2000 Published by Elsevier Science Ltd. All rights reserved.