DK, KPOI, Lab, VALUE, VALUE2, KEXPND, Lab2, Lab3, Lab4, Lab5, Lab6
Defines DOF constraints at keypoints.
KPOIKeypoint at which constraint is to be specified.
If ALL, apply to all selected keypoints [KSEL].
If KPOI = P, graphical picking is enabled
and all remaining command fields are ignored (valid only in the GUI).
A component name may also be substituted for KPOI.
LabValid degree of freedom label. If ALL, use all appropriate labels except HDSP. Structural labels: UX, UY, or UZ (displacements); ROTX, ROTY, or ROTZ (rotations); WARP (warping); HDSP (hydrostatic pressure). Thermal labels: TEMP, TBOT, TE2, TE3, . . ., TTOP (temperature). Acoustic labels: PRES (pressure); UX, UY, or UZ (displacements for FSI coupled elements). Electric labels: VOLT (voltage). Magnetic labels: MAG (scalar magnetic potential); AZ (vector magnetic potential). Diffusion labels: CONC (concentration).
VALUEDegree of freedom value or table name reference for
tabular boundary conditions. To specify a table, enclose the table
name in percent signs (%) (e.g., DK,NODE,TEMP,%tabname%). Use the *DIM command to define a table.
VALUE2Second degree of freedom value (if any). If the analysis
type and the degree of freedom allow a complex input, VALUE (above) is the real component and VALUE2 is the imaginary component.
KEXPNDExpansion key:
0 | — | Constraint applies only to the node at this keypoint. |
1 | — | Flags this keypoint for constraint expansion. |
Lab2, Lab3, Lab4, . . . , Lab6Additional degree of freedom labels. The same values are applied to the keypoints for these labels.
A keypoint may be flagged using KEXPND to allow its constraints to be expanded to nodes on the attached
solid model entities having similarly flagged keypoint constraints.
Constraints are transferred from keypoints to nodes with the DTRAN or SBCTRAN commands. The expansion
uses interpolation to apply constraints to the nodes on the lines
between flagged keypoints. If all keypoints of an area or volume
region are flagged and the constraints (label
and values) are equal, the constraints are applied to the
interior nodes of the region. See the D command
for a description of nodal constraints.
Tabular boundary conditions (VALUE = %tabname%) are available only for the following degree of freedom labels:
Electric (VOLT), structural (UX, UY, UZ, ROTX, ROTY, ROTZ), Acoustic
(PRES, UX, UY, UZ), and temperature (TEMP, TBOT, TE2, TE3, . . .,
TTOP).
Constraints specified by the DK command can conflict with other specified constraints. See Resolution of Conflicting Constraint Specifications in the Basic Analysis Guide for details.
This command is also valid in PREP7.