Mapdl.dl(line='', area='', lab='', value1='', value2='', **kwargs)[source]#

Defines DOF constraints on lines.

APDL Command: DL


Line at which constraints are to be specified. If ALL, apply to all selected lines [LSEL]. If LINE = 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 LINE.


Area containing line. The normal to the symmetry or antisymmetry surface is assumed to lie on this area. Defaults to the lowest numbered selected area containing the line number.


Symmetry label (see 2):

SYMM - Generate symmetry constraints.

ASYM - Generate antisymmetry constraints.


Value of DOF (real part) or table name reference on the line. Valid for all DOF labels. To specify a table, enclose the table name in % signs (e.g., DL,LINE,AREA,TEMP,%tabname%). Use the *DIM command to define a table.




You can transfer constraints from lines to nodes with the DTRAN or SBCTRAN commands. See the DK command for information about generating other constraints at lines.

Symmetry and antisymmetry constraints are generated as described on the DSYM command.

Setting Lab = VOLT and Value1 = 0 applies the J-normal boundary condition (current density vector (J) flows normal to the line). No input is required for the J-parallel condition because it is the natural boundary condition.

Tabular boundary conditions (Value1 = %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 DL 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.