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