74 lines
2.0 KiB
ReStructuredText
74 lines
2.0 KiB
ReStructuredText
.. index:: fix smd/integrate_ulsph
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fix smd/integrate_ulsph command
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===============================
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Syntax
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""""""
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.. code-block:: LAMMPS
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fix ID group-ID smd/integrate_ulsph keyword
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* smd/integrate_ulsph = style name of this fix command
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* zero or more keyword/value pairs may be appended
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* keyword = adjust_radius or limit_velocity
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adjust_radius values = adjust_radius_factor min_nn max_nn
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adjust_radius_factor = factor which scale the smooth/kernel radius
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min_nn = minimum number of neighbors
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max_nn = maximum number of neighbors
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limit_velocity values = max_velocity
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max_velocity = maximum allowed velocity.
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Examples
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""""""""
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.. code-block:: LAMMPS
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fix 1 all smd/integrate_ulsph adjust_radius 1.02 25 50
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fix 1 all smd/integrate_ulsph limit_velocity 1000
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Description
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"""""""""""
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The fix performs explicit time integration for particles which
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interact with the updated Lagrangian SPH pair style.
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See `this PDF guide <PDF/MACHDYN_LAMMPS_userguide.pdf>`_ to using Smooth Mach
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Dynamics in LAMMPS.
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The *adjust_radius* keyword activates dynamic adjustment of the
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per-particle SPH smoothing kernel radius such that the number of
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neighbors per particles remains within the interval *min_nn* to
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*max_nn*. The parameter *adjust_radius_factor* determines the amount
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of adjustment per timestep. Typical values are *adjust_radius_factor*
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=1.02, *min_nn* =15, and *max_nn* =20.
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The *limit_velocity* keyword will control the velocity, scaling the norm of
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the velocity vector to max_vel in case it exceeds this velocity limit.
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Restart, fix_modify, output, run start/stop, minimize info
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"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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Currently, no part of MACHDYN supports restarting nor
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minimization. This fix has no outputs.
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Restrictions
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""""""""""""
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This fix is part of the MACHDYN package. It is only enabled if
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LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info.
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Related commands
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""""""""""""""""
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none
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Default
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"""""""
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none
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