Coarsen Grid

The Coarsen Grid option operates in an opposite way to that for Refine Grid. It decreases the resolution of the grid. It operates independently by dividing the existing number of cells in the current grid in I, J directions. There are three types of coarsening grid:

Coarsen grid globally

1. LMC on the grid layer in the Layer Control to select the grid the user wants to Coarsen
2. Select Coarsen Grid option from the Grid menu, or click the Coarsen Grid button from the main toolbar (Figure 1).
3. The Grid Block Coarsening form will be popup, as shown in Figure 1. The user needs to enter the Coarsening Factor then click OK button. The default value for factors is 2. Figure 2 show examples for grid refinement.

Figure 1 Coarsen grid.

Figure 2 Grid after Coarsening.

Coarsen grid with a selected grid segment

1. LMC on the grid layer in the Layer Control to select the grid the user wants to coarsen
2. Select Select object button from the main toolbar
3. LMC on a grid node then hold Shift key, LMC on the second node on same grid segment in I or J direction, the segment will be highlighted as shown in Figure 3.
4. From Grid menu, select Coarsen Grid option (or select Coarsen Grid button from the main toolbar), the Grid Block Coarsening form will be popup as shown in Figure 4. The user needs to enter the Coarsening Factor then click OK button. Figure 5 shows examples for grid coarsening a selected grid segment.

Figure 3 Select a grid segment to highlight.

Figure 4 Grid Block Coarsening form.

Figure 5 An example of coarsening grid with a selected grid segment.

Coarsen grid with a selected grid block

1. LMC on the grid layer in the Layer Control to select grid the user want to refine
2. Select Select object button from the main toolbar
3. LMC on a grid node then hold Shift key, LMC on the second node which is not on same grid segment in I or J direction, the grid block will be highlighted as shown in Figure 6.
4. From Grid menu, select Coarsen Grid option (or select Coarsen Grid button from the main toolbar), the Grid Block Coarsening form will be popup as shown in Figure 7. The user needs to enter the Coarsening Factor then click OK button. Figure 8 shows examples for grid coarsening with a selected grid block.

Figure 6 Select a grid block to highlight.

Figure 7 Grid Block Coarsening form.

Figure 8 An example of coarsening grid with a selected grid block.