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After building a grid, it is necessary to modify and improve it. Clicking on the Grid menu in the main toolbar displays a number of options for this purpose, as shown in Figure 1 1143537899. The function of each option is described in the table below.

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	Figure 1
	Figure 1

Figure 1. Grid menu options.

Options	Description
Refine Grid	This option allows the user to increase the resolution of the grid. It operates by multiplying the existing number of cells in the current grid with I and J directions independently.
Coarsen Grid	This option operates in an opposite way to that for Refine Grid. It decreases the resolution of the grid.
Orthogonalize Grid	This option is used to reduce the orthogonal deviation of a grid.
Merge Two Grids	Often the model domain is too complex to create a single grid that accurately represents the area. Therefore, the user may have to create several grids and connect them using the Merge Two Grid tool.
Delete Selected Grid Block	When a grid block is selected, using this option will delete grid nodes inside the block.
Modify Indexing	This feature allows to change grid indices, including transpose I-J, flip I or J, and rotate I→J and J→I (Figure 2 1143537899). Transpose I - J Indices Flip I Indices Flip J Indices Rotate Indices Clockwise Rotate Indices Counter-Clockwise
Show Grid Properties	This feature allows showing grid's properties as shown in Figure 3 1143537899. None Orthogonal Deviation Cell Area Cell Aspect Ratio Cell DX Cell DY
Show Grid Labels	This feature allows showing grid's labels as shown in Figure 4 1143537899. None Nodal I,J Indices Cell I,J Indices Cell L Indices

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	Figure 2
	Figure 2

Figure 2. Modify Indexing options.

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	Figure 3
	Figure 3

Figure 3. Show Grid Properties options.

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	Figure 4
	Figure 4

Figure 4. Show Grid Labels options.

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