CELL

Bulk Data Entry Defines a unit cell comprised of lattice entities which can be used for space filling via the DLATTICE entry.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CELL CELLID
ROD R1_ID1 R1_ID2 R1_RAD1 R1_RAD2
ROD R2_ID1 R2_ID1 R2_RAD1 R2_RAD2
etc
ID1 X1 Y1 Z1
ID2 X2 Y2 Z2
etc

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CELL 2
ROD 1 3
ROD 3 2
1 0.0 1.0 2.0
2 1.0 3.0 4.0
3 6.0 2.0 0.5

Definitions

Field Contents SI Unit Example
CELLID Unit cell identification number. This ID can be referenced on the CELLID field of a DLATTICE Bulk Data Entry.

No default (Integer > 0)

ROD Flag indicating that the rod connectivity information is to follow.
Ri_ID1 Identifies the first point of the ROD “i" by referencing an IDi field value.

No default (Integer > 0)

Ri_ID2 Identifies the second point of the ROD “i" by referencing an IDi field value.

No default (Integer > 0)

Ri_RAD1 Defines the radius of the ROD “i", at the end of 1. 3

(Blank or Real > 0)

Ri_RAD2 Defines the radius of the ROD “i", at the end of 2. 3

(Blank or Real > 0)

IDi Identification numbers of points in the basic coordinate system. These points are used to identify rod connectivity to construct the unit cell.

No default (Integer > 0)

Xi, Yi, Zi Coordinates in the basic coordinate system of corresponding points IDi.

No default (Real)

Comments

  1. The unit cell defined via CELL Bulk Data Entry can be referenced on the DLATTICE Bulk Data Entry to create a filled volume with unit cells.
  2. Currently only ROD entities are supported and they are replaced by CBEAM elements when used on the DLATTICE Bulk Data Entry.
  3. The Ri_RAD1 and Ri_RAD2 entries allow definition of rods with non-uniform radii. If both the entries are blank, rods of constant radius are defined. If the radius at one end is specified, the radius at the other end must also be specified.