Often the a 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 Connect Merge Two Grids tool.
To connect merge two grids, open the user must have the initial grid open. The user should and then create a new layer for a new set of splines. These splines should extend from a location adjacent to the first grid and outline the new domain. Draw the farthest spline first, followed by the connection to the first grid and then the sides. When drawing the spline parallel to the first grid, ensure it is close to the edge. The user may then generate Generate the grid making sure while ensuring that the number of cells in the I or J-axis of the new grid matches the number of cells connecting it to the first grid. Select the Connect Two Grids tool and click two nodes on the grid line of the second grid where it is adjacent to the first grid. An example of this is shown in, Figure 1, Figure 2 and Figure 3.To insert a grid cell next to an existing cell, select two grid nodes of the existing cell (RMC on a node, hold the Shift key then LMC on the second node, the segment will be highlighted) then RMC to display options, select Line Mirror option as shown in Figure 1. As a result, a cell will be added that shares a grid line with the existing cell as shown in Figure 2
Suppose there are two grids (red and blue) that are visible, as shown in Merge Two Grids#Merge Two Grids#Figure 1, that we want to merge together. The visibility of all other grids should be turned off. These two grids meet the requirement for merging, as described above. Left-mouse click (LMC) on either grid01 or grid02 in the Layer Control panel to select it.
Set the cursor in selection mode by selecting the selection button from the toolbar or press S key from the keyboard, then LMC on the first node at the contacting edge, and hold the SHIFT key, then LMC on the second node along the contacting edge (note that the two nodes must be on the same grid line where two grids contact). If two grids have more than one overlapped grid line, you should select the block of overlapped nodes. In both cases, you don't have to select all overlapped grid nodes where the connection will occur, but you can select part of them where the nodes of two grids are mostly close to each other. Once the segment is highlighted, we can select one of three ways to merge them.
(1) Click the Merge Two Grids button from the main toolbar or,
(2) Go to the Grid menu then select Merge Two Grids option or,
(3) RMC to display options, select Merge Two Grids option.
Merge Two Grids#Merge Two Grids#Figure 2 shows options to merge two grids.
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Figure 1 Define where to insert a cell1. Two grids contacted.
Figure 2 A cell is added to the gridAnchor Figure 2 Figure 2
Figure 2. Options to merge two grids.
After merging the two grids, a new grid layer (the result grid layer) is added to the Layer Control panel as shown in Merge Two Grids#Merge Two Grids#Figure 3.
Grid+ also allows the merging of two grids in the case where there are overlapping cells as shown in Merge Two Grids#Merge Two Grids#Figure 4. In this case, instead of defining a contacting gridline, we define a grid block and then select Merge Two Grids option.
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Figure 3 Define where to insert multiple cells. A new grid is generated from merging two grids.
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Figure 4 Multiple cells are added to the grid4. Merge two grids by a grid block.