In the implementation of semicoarsening strategy, every other grid line along the x direction is eliminated from a fine grid to a coarse grid. Since the mesh aspect ratio γ is related to the relative values of △x and △y, we have different discrete equations on different grids with different γ (see Eq. (7)). Thus, inevitably, there will be a coarse grid on which Nx =Ny.Onthiscoarsegrid,thediscreteequationisactuallythestandardPoissonequation (with γ = 1). Starting from this grid, the following coarsening strategy will be standard full coarsening; i.e., every other grid lines in both the x and y directions is eliminated. So we call this specialized coarsening strategy partial semicoarsening strategy. As in standard multigrid method, the coarsest grid will have only one unknown.
In the implementation of semicoarsening strategy, every other grid line along the x direction is eliminated from a fine grid to a coarse grid. Since the mesh aspect ratio γ is related to the relative values of △x and △y, we have different discrete equations on different grids with different γ (see Eq. (7)). Thus, inevitably, there will be a coarse grid on which Nx =Ny.Onthiscoarsegrid,thediscreteequationisactuallythestandardPoissonequation (with γ = 1). Starting from this grid, the following coarsening strategy will be standard full coarsening; i.e., every other grid lines in both the x and y directions is eliminated. So we call this specialized coarsening strategy partial semicoarsening strategy. As in standard multigrid method, the coarsest grid will have only one unknown.
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