forked from lijiext/lammps
58 lines
1.9 KiB
Plaintext
58 lines
1.9 KiB
Plaintext
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Section_commands.html#comm)
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:line
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compute smd/hourglass_error command :h3
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[Syntax:]
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compute ID group-ID smd/hourglass_error :pre
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ID, group-ID are documented in "compute"_compute.html command
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smd/hourglass_error = style name of this compute command :ul
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[Examples:]
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compute 1 all smd/hourglass_error :pre
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[Description:]
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Define a computation which outputs the error of the approximated
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relative separation with respect to the actual relative separation of
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the particles i and j. Ideally, if the deformation gradient is exact,
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and there exists a unique mapping between all particles' positions
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within the neighborhood of the central node and the deformation gradient,
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the approximated relative separation will coincide with the actual relative
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separation of the particles i and j in the deformed configuration.
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This compute is only really useful for debugging the hourglass control mechanim which is part of the Total-Lagrangian SPH pair style.
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See "this PDF guide"_USER/smd/SMD_LAMMPS_userguide.pdf to use Smooth Mach Dynamics in LAMMPS.
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[Output Info:]
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This compute calculates a per-particle vector, which can be accessed by
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any command that uses per-particle values from a compute as input. See
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"How-to discussions, section 6.15"_Section_howto.html#howto_15
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for an overview of LAMMPS output options.
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The per-particle vector values will are dimensionless. See "units"_units.html.
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[Restrictions:]
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This compute is part of the USER-SMD package. It is only enabled if
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LAMMPS was built with that package. See the "Making LAMMPS"_Section_start.html#start_3
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section for more info.
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This quantity will be computed only for particles which interact with tlsph pair style.
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[Related Commands:]
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"smd/tlsph_defgrad"_compute_smd_tlsph_defgrad.html
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[Default:]
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