ansys.mapdl.core.Mapdl.pbc#

Mapdl.pbc(item='', key='', min_='', max_='', abs_='', **kwargs)#

Shows boundary condition (BC) symbols and values on displays.

Mechanical APDL Command: /PBC

Command default:

No symbols displayed.

Parameters:
itemstr

Label identifying the item:

  • U - Applied translational constraints (UX, UY, UZ).

  • ROT - Applied rotational constraints (ROTX, ROTY, ROTZ).

  • TEMP - Applied temperatures (TEMP, TBOT, TE2, TE3,…, TTOP).

  • PRES - Applied fluid pressures.

  • V - Applied flow velocities (VX, VY, VZ).

  • VOLT - Applied voltages.

  • MAG - Applied scalar magnetic potentials.

  • A - Applied vector magnetic potentials.

  • CONC - Concentration.

  • CHRG - Applied electric charge.

  • F or FORC - Applied structural forces (FX, FY, FZ).

  • M or MOME - Applied structural moments (MX, MY, MZ).

  • HEAT - Applied heat flows (HEAT, HBOT, HE2, HE3,…, HTOP).

  • FLOW - Applied fluid flow.

  • AMPS - Applied current flow.

  • FLUX - Applied magnetic flux.

  • CSG - Applied magnetic current segments.

  • RATE - Diffusion flow rate.

  • MAST - Master degrees of freedom.

  • CP - Coupled nodes.

  • CE - Nodes in constraint equations.

  • NFOR - POST1 nodal forces.

  • NMOM - POST1 nodal moments

  • RFOR - POST1 reaction forces.

  • RMOM - POST1 reaction moments (MX, MY, MZ).

  • PATH - Path geometry (undistorted) associated with the path command after a pdef or pvect command has been issued.

  • ACEL - Global acceleration (ACELX, ACELY, ACELZ vector).

  • OMEG - Global angular velocity (OMEGX, OMEGY, OMEGZ vector) and acceleration (DOMEGX, DOMEGY, DOMEGZ vector).

  • ALL - Represents all appropriate labels.

keyint or str

Symbol key:

  • 0 - Do not show symbol.

  • 1 - Show symbol.

  • 2 - Plot value next to symbol.

min_str

Minimum value in a range of values plotted on screen.

max_str

Maximum value in a range of values plotted on screen.

abs_str

Absolute number. If KEY = 2 and ABS = 0, a number falling between the MIN and MAX is displayed. If ABS is not specified, it defaults to 0. If KEY = 2 and ABS = 1, an absolute value falling between the MIN and MAX is displayed. ABS = 1 lets you eliminate the display of numbers whose absolute values are less than a desired tolerance. For example, if ABS = 1, MIN = 10 and MAX = 1e8, values such as.83646 and -5.59737 are not displayed.

Notes

The /PBC command adds degree of freedom constraint, force load, and other symbols to displays.

Symbols are applied to the selected nodes only. All arrow and arrowhead symbols are oriented in the nodal coordinate system and lie in two perpendicular planes. Force arrows are scaled proportional to their magnitude. (If KEY = 1, use vscale to change arrow length.) For scalar quantities, the specific component direction (that is, x, y, or z) of the symbol has no meaning, but the positive or negative sense (for example, positive or negative x) represents a positive or negative scalar value, respectively.

The effects of the /PBC command are not cumulative (that is, the command does not modify an existing setting from a previously issued /PBC command). If you issue multiple /PBC commands during an analysis, only the setting specified by the most recent pbc command applies.

Use pstatus or pbc,STAT to display settings. Use pbc,DEFA to reset all specifications back to default. See the psf and pbf commands for other display symbols.

In a cyclic symmetry analysis, the pbc command is deactivated when cyclic expansion is active ( cycexpand,,ON). To view boundary conditions on the base sector, deactivate cyclic expansion ( cycexpand,,OFF) and issue this command: pbc,ALL,,1

Issuing the command pbc,PATH,,1 displays all defined paths.

The pbc command is valid in any processor.