“…This approach recognizes the different nature of these physical processes and the potential advantage of using different numerical approaches for simulation. Similar approaches and ideas presented in this paper, but not considered to be streamline methods, are described by Bratvedt 7,8 , Hales 30 , Ewing 21 , Glimm 27 and others 24,40,43,44 . The basic streamline approach also is described by King 50,51 and others 9,13,18,52,54 .…”