nodal velocity boundary conditions -- these need not be entered
for every node; if unspecified it is assumed zero. These velocities
are entered in the same format as displacement boundary conditions
(just above). The velocities in this list are applied starting at the
time given immediately before this block; the velocity specified is multiplied
by the current time step and applied at each step for the designated period.
This block (and the preceding turn-on time) are repeated "nrates" times,
and are absent entirely if nrates=0 (no velocity b.c.'s).
example:
(a) (b) (c)
23 0 -0.01 0.0
(a) node # -- global index number of node
(b) gen order -- used to specify a range of nodes; generally just
leave it 0 unless doing something special.
(c) velocity values -- there are ndof numbers; these give the 1-, 2- or 3-dimensional
velocity to apply to this node.
End nodal velocity boundary condition block with two zeros.