forked from lijiext/lammps
53 lines
1.8 KiB
Plaintext
53 lines
1.8 KiB
Plaintext
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"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_shape command :h3
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[Syntax:]
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compute ID group-ID smd/tlsph_shape :pre
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ID, group-ID are documented in "compute"_compute.html command
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smd/tlsph_shape = style name of this compute command :ul
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[Examples:]
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compute 1 all smd/tlsph_shape :pre
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[Description:]
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Define a computation that outputs the current shape of the volume associated with a particle as a rotated ellipsoid.
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It is only meaningful for particles which interact according to 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 of vectors, which can be
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accessed by 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 has 7 entries. The first three entries correspond to the lengths of the ellipsoid's axes and have units of length.
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These axis valus are computed as the contact radius times the xx, yy, or zz components of the Green-Lagrange strain tensor associated with the particle.
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The next 4 values are quaternions (order: q, x, y, z) which describe the spatial rotation of the particle relative to its initial state.
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[Restrictions:]
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This compute is part of the USER-SMD package. It is only enabled if LAMMPS was
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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 the Total-Lagrangian SPH pair style.
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[Related commands:]
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"smd/contact_radius"_compute_smd_contact_radius.html
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[Default:] none
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