Boundary condition definition

@ENTITY_NAME {EntityName }
@COMMENTS {CommentText}


  1. A boundary condition is applied to an entity, which could be a vertex or an edge.
  2. Boundary conditions are specified for each component of displacements and rotations. Each of the flags Idi can take values of 0 or 1. A value Idi = 0 implies that the corresponding degree of freedom is unconstrained, whereas a value Idi = 1 implies that the corresponding displacement or rotation component will be set to a zero value.
    1. Flags Id1, Id2, and Id3 correspond to the displacement components along the inertial axes i1, i2, and i3, respectively.
    2. Flags Id4, Id5, and Id6 correspond to the rotation components about the inertial axes i1, i2, and i3, respectively.
  3. If non zero, time dependent displacements or rotations must be prescribed, this can be done using the prescribed displacement element instead of boundary conditions.
  4. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.