Grid Point
Description: Defines the location of a geometric grid point, the directions of its displacement, and its permanent single-point constraints.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| ID | Grid point identification number. | Integer > 0 | Required |
| CP | Identification number of coordinate system in which the location of the grid point is defined. | Integer ≥ 0 or blank | 0 |
| X1, X2, X3 | Location of the grid point in coordinate system CP. | Real | Required |
| CD | Identification number of coordinate system in which the displacements, degrees of freedom, constraints, and solution vectors are all defined at the grid point. | Integer ≥ 0 or blank | 0 |
| PS | Permanent single-point constraints associated with grid point (any of the digits 1-6 with no imbedded blanks). | Integer ≥ 0 or blank | |
| SEID | Superelement identification number. | Integer ≥ 0 or blank |
Remarks:
- All grid point identification numbers must be unique with respect to all other grid, scalar, and extra points.
- The meaning of X1, X2 and X3 depend on the type of coordinate system, CP, as follows (see
CORDi entry descriptions):
Type X1 X2 X3 Rectangular X Y Z Cylindrical R θ (degrees) Z Spherical R θ (degrees) ϕ (degrees) - The collection of all CD coordinate systems defined on all GRID entries is called the global coordinate system. All degrees of freedom, constraints, and solution vectors are expressed in the global coordinate system.
- The SEID field can be overridden by use of the SESET entry.
- A zero (or blank if the GRDSET entry is not specified) in the CP or CD fields refers to the basic coordinate system.