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BoundaryID Command

The BoundaryID command sets an ID to assign to subsequent velocity or temperature boundary conditions:

BoundaryID <(num)>

where (num) is an integer value for the boundary condition ID. All supported boundary conditions will use this ID until it is changed by another BoundaryID command. If (num) is omitted the ID reverts to zero.

The main reason to assign IDs to boundary conditions is to the control the calculation of reaction forces or heat watts.

Notes

  1. The only boundary conditions that currently make use of an ID are velocity and temperature boundary conditions.
  2. Velocity boundary conditions created by symmetry planes or by rigid material particles when ExtrapolateRigid is used, will automatically have the following boundary IDs: Other boundary conditions should not use these IDs unless either there are no symmetry planes or you want the other boundary conditions lumped in with the symmetry plane boundary conditions. Note that temperature boundary conditions on symmetry planes will not get these IDs; they can be set using BoundaryID methods if needed.