44 lines
1.2 KiB
ReStructuredText
44 lines
1.2 KiB
ReStructuredText
.. index:: fix_modify AtC boundary_dynamics
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fix_modify AtC boundary_dynamics command
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========================================
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Syntax
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""""""
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.. parsed-literal::
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fix_modify <AtC fixID> boundary_dynamics <on|damped_harmonic|prescribed|coupled|none>
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* AtC fixID = ID of :doc:`fix atc <fix_atc>` instance
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* boundary_dynamics = name of the AtC sub-command
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* *on* or *damped_harmonic* *prescribed* *coupled* *none*
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Description
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"""""""""""
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Sets different schemes for controlling boundary atoms. *on* will integrate
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the boundary atoms using the velocity-verlet algorithm. *damped_harmonic*
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uses a mass/spring/dashpot for the boundary atoms with added arguments
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of the damping and spring constants followed by the ratio of the
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boundary type mass to the desired mass. *prescribed* forces the boundary
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atoms to follow the finite element displacement. *coupled* does the same.
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Restrictions
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""""""""""""
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Boundary atoms must be specified. When using swaps between internal and
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boundary atoms, the initial configuration must have already correctly
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partitioned the two.
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Related AtC commands
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""""""""""""""""""""
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- :ref:`fix_modify AtC command overview <atc_fix_modify>`
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Default
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"""""""
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*prescribed on*
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