1. This step "distributes" the cell residual of step1proportionally to the solution grid points resulting in a Lax-hiendroff type formulation of the grid point correction equations.Erpressedin this form, the numerical signal
2. The multiple-grid accelerator consists of application of the following procedure on one or more progressively coarser meshes. The process beqins by elimination of every other grid line in both coordinate directions resulting in what will be called the 2h mesh. A typical coarse grid cell is shown in figure 2. Note we now have access to the next level finer qrid points shown as points 5-9 in the figure. First 6Uiat all 2h grid points is initialized to zero. Then, following the basic solver, the 2h mesli is swept cell by cell performinq the following steps: STEP 1: Finite volume approximation