Data sets can be stored to either ASCII or binary files. Multiple data sets can be stored in a single file and both scalar and vector data sets can be saved to the same file. The file format is identical for 2D and 3D data sets. The ASCII data set format is shown in Figure 1. A sample data set file is shown in Figure 2.
For scalar data set files, one value is listed per vertex, cell, node, or scatter point. For vector data set files, one set of xyz vector components is listed per vertex, cell, node, or scatter point. If necessary, a set of status flags can be included in the file. If the status flag is false (0), the corresponding item (node, cell, etc.) is inactive. If status flags are not included in the file, it is assumed that all items are active.
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DATASET |
/* File type identifier */ |
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OBJTYPE type |
/* Type of object data set is associated with */ |
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BEGSCL |
/* Beginning of scalar data set */ |
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OBJID id |
/* Object id */ |
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ND numdata |
/* Number of data values */ |
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NC numcells |
/* Number of cells or elements */ |
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NAME "name" |
/* Data set name */ |
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TS istat time |
/* Time step of the following data. */ |
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stat1 |
/* Status flags */ |
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stat2 |
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. |
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. |
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statnumcells |
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val1 |
/* Scalar data values */ |
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val2 |
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. |
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. |
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valnumdata |
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/* Repeat TS card for each time step */ |
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ENDDS |
/* End of data set */ |
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BEGVEC |
/* Beginning of vector dataset */ |
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VECTYPE type |
/* Vector at node/gridnode or element/cell */ |
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OBJID id |
/* Object id */ |
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ND numdata |
/* Number of data values */ |
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NC numcells |
/* Number of cells or elements */ |
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NAME "name" |
/* Data set name */ |
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TS istat time |
/* Time step of the following data. */ |
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stat1 |
/* Status flags */ |
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stat2 |
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. |
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. |
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statnumcells |
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vx1 vy1 vz1 |
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vx2 vy2 vz2 |
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. |
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. |
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vnumdata vnumdata vnumdata |
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/* Repeat TS card for each time step */ |
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ENDDS |
/* End of data set */ |
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/* Repeat BEGSCL and BEGVEC sequences for each data set */ |
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Figure 1. ASCII Data Set File Format.
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DATASET |
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OBJTYPE grid2d |
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BEGSCL |
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OBJID 27211 |
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ND 8 |
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NC 8 |
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NAME "trichloroethylene" |
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TS 1 1.00000000e+00 |
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0 |
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0 |
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0 |
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1 |
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1 |
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1 |
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1 |
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0 |
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0.00000000e+00 |
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0.00000000e+00 |
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0.00000000e+00 |
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3.24000000e+00 |
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4.39000000e+00 |
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2.96000000e+00 |
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7.48000000e+00 |
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0.00000000e+00 |
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ENDDS |
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BEGVEC |
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VECTYPE 0 |
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OBJID 27211 |
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ND 8 |
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NC 8 |
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NAME "velocity" |
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TS 1 5.00000000e+00 |
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0 |
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0 |
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0 |
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1 |
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1 |
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1 |
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1 |
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0 |
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1.60000000e+01 1.60000000e+01 3.20000000e+01 |
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6.40000000e+01 6.40000000e+01 1.28000000e+02 |
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1.44000000e+02 1.44000000e+02 2.88000000e+02 |
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1.96000000e+02 1.96000000e+02 3.92000000e+02 |
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2.25000000e+02 2.25000000e+02 4.50000000e+02 |
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9.21600000e+03 9.21600000e+03 1.84320000e+04 |
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9.60400000e+03 9.60400000e+03 1.92080000e+04 |
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9.80100000e+03 9.80100000e+03 1.96020000e+04 |
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ENDDS |
Figure 2. Sample ASCII Data Set File.
The card types used in the scalar data set file format are as follows:
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Card Type |
DATASET |
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Description |
File type identifier. Must be on first line of file. No fields. |
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Required |
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Card Type |
OBJTYPE |
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Description |
Identifies the type of objects that the data sets in the file are associated with. |
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Required |
YES. If card does not exist, the file can only be read through the Data Browser. The data sets would then be assigned to the objects corresponding to the active module. |
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Format |
OBJTYPE type |
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Sample |
OBJTYPE tin |
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Field |
Variable |
Value |
Description | ||||||||||||||
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1 |
type |
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Card Type |
BEGSCL |
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Description |
Scalar data set file identifier. Marks beginning of scalar data set. No fields. |
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Required |
YES |
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Card Type |
BEGVEC |
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Description |
Vector data set file identifier. Marks beginning of vector data set. No fields. |
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Required |
YES |
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Card Type |
VECTYPE |
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Card ID |
150 |
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Description |
Identifies the type of vector data that will be read and where to apply it. |
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Required |
This card is only required if the vector data is associated with elements/cells. If this card is not present, it is assumed that the data are associated with nodes/gridnodes. |
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Field |
Variable |
Size |
Value |
Description | ||||
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1 |
type |
4 byte int |
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Card Type |
ND |
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Description |
The number of data values that will be listed per time step. This number should correspond to the total number of vertices, nodes, cells centers (cell-centered grid), cell corners (mesh-centered grid), maximum node id (meshes) or scatter points. |
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Required |
YES |
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Format |
ND numdata |
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Sample |
ND 10098 |
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Field |
Variable |
Value |
Description |
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1 |
numdata |
+ |
The number of items. At each time step, numdata values are printed. |
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Card Type |
NC |
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Description |
This number should correspond to the maximum element id (meshes) or the number of cells (grids). |
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Required |
YES |
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Format |
NC numcells |
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Sample |
NC 3982 |
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Field |
Variable |
Value |
Description |
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1 |
numcells |
+ |
The number of elements or cells. |
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Card Type |
NAME |
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Description |
The name of the data set. |
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Required |
YES |
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Format |
NAME "name" |
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Sample |
NAME "Total head" |
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Field |
Variable |
Value |
Description |
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1 |
"name" |
str |
The name of the dataset in double quotes. |
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Card Type |
TS |
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Description |
Marks the beginning of a new time step, indicates if stat flags are given, and defines the time step value, status flags, and scalar data values for each item. |
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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 |
istat |
0 |
Use status flags from previous time step. For first time step, this indicates that all cells are active. | |||||||||||
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1 |
Status flags will be listed. | |||||||||||||
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2 |
time |
+ |
The time step value. If only one time step exists, time is not required | |||||||||||
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2 - (n+1) |
stat |
0,1 |
The status of each item. If active, stat=1. If inactive stat=0. Omitted if i=0 on STAT card. | |||||||||||
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(n+2) - (2n+1) |
val |
± |
The scalar data values of each item. | |||||||||||