Application of a modified discrete ordinates method to two-dimensional enclosures of irregular geometry

This paper is an extension of a modified discrete ordinates method recently proposed by other researchers and intended to counter the ray effect inher ent in this method. The media analysed are absorbing, emitting and isotropi cally or anisotropically scattering and the enclosure geometry is arbitrary . The radiative intensity is broken into two parts: the wall-related intens ity and the medium-related intensity. The former is treated separately by i ntegration over the entire solid angles (not using the angular quadrature). The new differencing scheme recently developed by the authors and based on triangular grids (ideally suited to complex geometry) is used in the prese nt study. Results confirm that the proposed method is a good general remedy for anomalies caused by the ray effect. (C) 1999 Elsevier Science Ltd. All rights reserved.