Bem Solution for the Problem of Flux of a Multicomponent Mixture of Gases Out of a Multilayer Landfill

A two-dimensional numerical model for convection–diffusion flow of a multigas mixture through a multilayer porous medium was developed with the aim to be used for evaluation of emissions of gases from landfills. The proposed model is based on the boundary element–dual reciprocity method. Time-independent one-dimensional analytical solutions for a multilayer domain were found for the cases of a single gas and a two-gas mixture and used to verify the accuracy of the model. Although the proposed technique is a simple one, consisting only of boundary integrals, it was found that the technique can be applied with satisfactory accuracy to the problem at which it was initially aimed.