69 lines
1.6 KiB
ReStructuredText
69 lines
1.6 KiB
ReStructuredText
.. index:: compute sph/rho/atom
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compute sph/rho/atom 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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compute ID group-ID sph/rho/atom
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* ID, group-ID are documented in :doc:`compute <compute>` command
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* sph/rho/atom = style name of this compute command
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Examples
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""""""""
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.. code-block:: LAMMPS
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compute 1 all sph/rho/atom
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Description
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"""""""""""
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Define a computation that calculates the per-atom SPH density for each
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atom in a group, i.e. a Smooth-Particle Hydrodynamics density.
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The SPH density is the mass density of an SPH particle, calculated by
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kernel function interpolation using "pair style sph/rhosum".
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See `this PDF guide <PDF/SPH_LAMMPS_userguide.pdf>`_ to using SPH in
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LAMMPS.
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.. note::
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Please note that the SPH PDF guide file has not been updated for
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many years and thus does not reflect the current *syntax* of the
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SPH package commands. For that please refer to the LAMMPS manual.
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The value of the SPH density will be 0.0 for atoms not in the
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specified compute group.
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Output info
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"""""""""""
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This compute calculates a per-atom vector, which can be accessed by
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any command that uses per-atom values from a compute as input. See
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the :doc:`Howto output <Howto_output>` page for an overview of
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LAMMPS output options.
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The per-atom vector values will be in mass/volume :doc:`units <units>`.
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Restrictions
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""""""""""""
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This compute is part of the SPH 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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:doc:`dump custom <dump>`
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Default
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"""""""
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none
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