2D Grid Files: Difference between revisions
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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. | 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. | ||
{|class = "wikitable" | {|class="wikitable" style="border:1px #AAA solid;" | ||
|- | |- | ||
|width="250"|GRID2D | |width="250"|GRID2D | ||
| Line 35: | Line 35: | ||
|} | |} | ||
''Figure 1. 2D Grid File Format.'' | ''Figure 1. 2D Grid File Format.'' | ||
{|class = "wikitable" | {| class="wikitable" style="border:1px #AAA solid;" | ||
|- | |- | ||
|GRID2D | |GRID2D | ||
| Line 68: | Line 69: | ||
Figure 2. Sample 2D Grid File. | Figure 2. Sample 2D Grid File. | ||
The card types used in the 2D grid file format are as follows: | 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: | |||
i = 0 for mesh-centered | |||
i = 1 for cell-centered | |||
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 | |||
DIM nx ny | |||
x1 | |||
x2 | |||
. | |||
. | |||
xnx | |||
y1 | |||
y2 | |||
. | |||
. | |||
yny | |||
Sample | |||
DIM 4 6 | |||
0.0 | |||
1.0 | |||
2.0 | |||
4.0 | |||
10.0 | |||
12.0 | |||
14.0 | |||
16.0 | |||
18.0 | |||
20.0 | |||
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. | |||
[[Category:File format]] | [[Category:File format]] | ||
Revision as of 00:12, 23 August 2007
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.
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: i = 0 for mesh-centered
i = 1 for cell-centered
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
DIM nx ny
x1
x2
.
.
xnx
y1
y2
.
.
yny
Sample
DIM 4 6
0.0
1.0
2.0
4.0
10.0
12.0
14.0
16.0
18.0
20.0
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.
