|
»Click here to display Table of Contents«
|
GRID |
|
|
|
|
|
GRID |
|
|
|
|
|
»Click here to display Table of Contents«
|
GRID |
|
|
|
|
|
GRID |
|
|
|
|
Bulk Data Entry
GRID – Grid Point
Description
Defines the location of a geometric grid point of the structural model, the directions of its displacement, and its permanent single-point constraints.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
GRID |
ID |
CP |
X1 |
X2 |
X3 |
CD |
PS |
|
|
|
Field |
Contents |
ID |
Unique grid point identification number. (Integer > 0) |
CP |
Coordinate system identification number in which the location of the grid point is defined. (Integer > 0 or blank) |
X1,X2,X3 |
Location of the grid point in coordinate system CP. (Real) |
CD |
Coordinate system identification number in which the displacements, degrees-of-freedom, constraints, and solution vectors are defined at grid point. = -1: defines a fluid grid point in the coupled fluid-structural analysis. This type of point may only connect solid elements to defined fluid elements. (Integer > -1 or blank) |
PS |
Permanent single-point constraints associated with grid point. Up to six unique digits may be placed in the field with no imbedded blanks. (Integer > 0 or blank) |
See the GRDSET entry for default options for fields 3, 7, and 8.
| 1. | All grid point identification numbers must be unique with respect to all other structural grid and scalar points. A duplicate identification number is only allowed if all fields on the duplicated entries are exactly the same, unless PARAM,DUPTOL is used. PARAM,DUPTOL can be used to set a tolerance that will allow a GRID with same ID, CP, CD, and PS to have slightly different coordinates. |
| 2. | The meaning of X1, X2, and X3 depends on the type of coordinate system, CP, as follows: (see CORDI entry descriptions). |
Type |
X1 |
X2 |
X3 |
Rectangular |
X |
Y |
Z |
Cylindrical |
R |
q(degrees) |
Z |
Spherical |
R |
q(degrees) |
f(degrees) |
| 3. | 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. |
| 4. | If CP, PS, or CD is blank, information from the GRDSET data will be used. If CP or CD contains a zero, the basic coordinate system will be used. If PS contains a zero, single point constraints on the GRDSET data are ignored. |
| 5. | Input data replication is available for the GRID data. This can be used to generate additional GRID data, based on incrementing the GRID ID and coordinate locations. |
| 6. | This card is represented as a node in HyperMesh. |
See Also:
