2D Grid Files
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Two-dimensional grids are stored in 2D grid files. The grids can be either cell-centered or mesh-centered. If the grid is mesh-centered, a set of material IDs may be included in the file. The 2D grid file format is shown in Figure 1, and a sample file in Figure 2.
| GRID2D | /* File type */ |
| TYPE i | /* Type of grid. Mesh or Cell centered. */ |
| IJ ±idir ±jdir | /* Card for defining rows, columns. */ |
| DIM nx ny | /* # of cell boundaries in each direction. */ |
| x1 | /* X coord. of cell boundaries. */ |
| x2 | |
| . | |
| . | |
| xnx | |
| y1 | /* Y coord. of cell boundaries. */ |
| y2 | |
| . | |
| . | |
| yny | |
| DELEV el | /* Default elevation for grid. */ |
Figure 1. 2D Grid File Format.
| GRID2D |
| ID 5758 |
| TYPE 1 |
| DELEV 0.000000000000000e+00 |
| IJ -y +x |
| DIM 4 4 |
| 0.000000000000000e+00 |
| 3.333333333333334e+01 |
| 6.666666666666667e+01 |
| 1.000000000000000e+02 |
| 0.000000000000000e+00 |
| 3.333333333333334e+01 |
| 6.666666666666667e+01 |
| 1.000000000000000e+02 |
Figure 2. Sample 2D Grid File.
2D Grid Files Card Types
The card types used in the 2D grid file format are as follows:
| Card Type | GRID2D |
|---|---|
| Description | File type identifier. Must be on first line of file. No fields. |
| Required | YES |
| Card Type | TYPE | ||
|---|---|---|---|
| Description | Defines the type of grid as either cell- or mesh-centered. | ||
| Required | YES | ||
| Format | TYPE i | ||
| Sample | TYPE 0 | ||
| Field | Variable | Value | Description |
| 1 | i | 0,1 | The type code:
|
| Card Type | IJ | ||
|---|---|---|---|
| Description | Defines the orientation of the i,j indices. | ||
| Required | YES | ||
| Format | IJ ±idir ±jdir | ||
| Sample | IJ +x -y | ||
| Field | Variable | Value | Description |
| 1 | ±idir | ±x,±y | The direction corresponding to an increasing i index. |
| 2 | ±jdir | ±x,±y | The direction corresponding to an increasing j index. |
| Card Type | DIM | ||
|---|---|---|---|
| Description | Defines the dimensions of the grid. | ||
| Required | YES | ||
| Format |
| ||
| Sample |
| ||
| Field | Variable | Value | Description |
| 1 | nx | + | The number of cell boundaries in the x direction. |
| 2 | ny | + | The number of cell boundaries in the y direction. |
| 3 to (nx+2) | x1-xnx | ± | The coordinates of the x boundaries. |
| (nx+3) to (nx+ny+2) | y1-yny | ± | The coordinates of the y boundaries. |
| Card Type | DELEV | ||
|---|---|---|---|
| Description | Defines a default elevation for the grid. | ||
| Required | NO | ||
| Format | DELEV el | ||
| Sample | DELEV 100.0 | ||
| Field | Variable | Value | Description |
| 1 | el | ± | The default elevation. |
