Dual scattering channel schemes and transmission line methods
  Dual scattering channel (DSC) schemes naturally extend the transmission line matrix (TLM) numerical method beyond the lines set up by P.B.JOHNS and coworkers. Conceptually, DSC schemes retain from TLM the typical formal splitting of the computed fields into incident and reflected components, interchanged and scattered between adjacent cells, without yet a need for transmission lines. They generally admit non trivial cell interface scattering and so release from a set of modeling limitations to that the classical TLM method is subject. The elements characterizing DSC schemes are outlined and illustrated by coupling within a non-orthogonal mesh a model of heat propagation to a lossy Maxwell field. 
Steffen Hein