forked from lijiext/lammps
55 lines
1.7 KiB
Plaintext
55 lines
1.7 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/tlsph_dt command :h3
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[Syntax:]
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compute ID group-ID smd/tlsph_dt :pre
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ID, group-ID are documented in "compute"_compute.html command
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smd/tlsph_dt = style name of this compute command :ul
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[Examples:]
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compute 1 all smd/tlsph_dt :pre
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[Description:]
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Define a computation that outputs the CFL-stable time increment per particle.
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This time increment is essentially given by the speed of sound, divided by the SPH smoothing length.
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Because both the speed of sound and the smoothing length typically change during the course of a simulation,
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the stable time increment needs to be recomputed every time step.
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This calculation is performed automatically in the relevant SPH pair styles and this compute only serves to make the
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stable time increment accessible for output purposes.
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See "this PDF guide"_USER/smd/SMD_LAMMPS_userguide.pdf to using 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 values will be given in "units"_units.html of time.
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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 compute can only be used for particles interacting with the Total-Lagrangian SPH pair style.
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[Related commands:]
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"smd/adjust_dt"_fix_smd_adjust_dt.html
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[Default:] none
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