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Velocity Addition
*****************

The ``VELOCITY ADDITION`` capability is used to additively modify nodal velocities at a specified time.

.. code-block:: sierrainput

   BEGIN VELOCITY ADDITION
     BLOCK = <string list>block_names
     INCLUDE ALL BLOCKS
     APPLY AT TIME = <real>time
     COMPONENT = <string>X|Y|Z |
       DIRECTION = <string>defined_direction
     MAGNITUDE = <real>magnitude_of_velocity
   END
