DA, AREA, Lab, Value1, Value2
Defines degree-of-freedom constraints on areas.
AREAArea on which constraints are to be specified. If
ALL, apply to all selected areas [ASEL]. If AREA = 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 AREA.
LabSymmetry label (see 2 below):
SYMM | — | Generate symmetry
constraints. Requires no |
ASYM | — | Generate antisymmetry
constraints. Requires no |
ANSYS DOF labels (see 1, 2, and 3 below):
UX | — | Displacement in X direction. |
UY | — | Displacement in Y direction. |
UZ | — | Displacement in Z direction. |
ROTX | — | Rotation about X axis. |
ROTY | — | Rotation about Y axis. |
ROTZ | — | Rotation about Z axis. |
HDSP | — | Hydrostatic pressure. |
PRES | — | Pressure. |
TEMP, TBOT, TE2, TE3, . . ., TTOP | — | Temperature. |
MAG | — | Magnetic scalar potential. |
VOLT | — | Electric scalar potential. |
AZ | — | Magnetic vector potential in Z direction (see 1). |
CONC | — | Concentration. |
ALL | — | Applies all appropriate DOF labels except HDSP. |
Value1Value of DOF or table name reference on the area.
Valid for all DOF labels. To specify a table, enclose the table
name in % signs (e.g., DA,AREA,TEMP,%tabname%). Use the *DIM command to define a table.
Value2For MAG and VOLT DOFs:
Value of the imaginary component of the degree of freedom.
For elements SOLID236 and SOLID237, if Lab = AZ and Value1 = 0, this sets the flux-parallel
condition for the edge formulation. (A flux-normal condition is the
natural boundary condition.) Do not use the DA command to set the edge-flux DOF,
AZ to a nonzero value.
If Lab =
MAG and Value1 = 0, this sets the flux-normal
condition for the magnetic scalar potential formulations (MSP) (A
flux-parallel condition is the natural boundary condition for MSP.)
If Lab =
VOLT and Value1 = 0, the J-normal condition
is set (current density (J) flow normal to the area). (A J-parallel
condition is the natural boundary condition.)
You can transfer constraints from areas to nodes with the DTRAN or SBCTRAN commands. See the DK command for information about generating other constraints on areas.
Symmetry and antisymmetry constraints are generated as described for the DSYM command.
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 DA command can conflict with other specified constraints. See Resolution of Conflicting Constraint Specifications\ in the Basic Analysis Guide for details.