forked from lijiext/lammps
71 lines
2.2 KiB
Plaintext
71 lines
2.2 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 erotate/asphere command :h3
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[Syntax:]
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compute ID group-ID erotate/asphere :pre
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ID, group-ID are documented in "compute"_compute.html command
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erotate/asphere = style name of this compute command :ul
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[Examples:]
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compute 1 all erotate/asphere :pre
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[Description:]
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Define a computation that calculates the rotational kinetic energy of
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a group of aspherical particles. The aspherical particles can be
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ellipsoids, or line segments, or triangles. See the
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"atom_style"_atom_style.html and "read_data"_read_data.html commands
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for descriptions of these options.
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For all 3 types of particles, the rotational kinetic energy is
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computed as 1/2 I w^2, where I is the inertia tensor for the
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aspherical particle and w is its angular velocity, which is computed
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from its angular momentum if needed.
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IMPORTANT NOTE: For "2d models"_dimension.html, ellipsoidal particles
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are treated as ellipsoids, not ellipses, meaning their moments of
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inertia will be the same as in 3d.
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[Output info:]
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This compute calculates a global scalar (the KE). This value can be
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used by any command that uses a global scalar value from a compute as
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input. See "Section_howto 15"_Section_howto.html#howto_15 for an
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overview of LAMMPS output options.
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The scalar value calculated by this compute is "extensive". The
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scalar value will be in energy "units"_units.html.
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[Restrictions:]
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This compute requires that ellipsoidal particles atoms store a shape
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and quaternion orientation and angular momentum as defined by the
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"atom_style ellipsoid"_atom_style.html command.
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This compute requires that line segment particles atoms store a length
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and orientation and angular velocity as defined by the "atom_style
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line"_atom_style.html command.
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This compute requires that triangular particles atoms store a size and
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shape and quaternion orientation and angular momentum as defined by
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the "atom_style tri"_atom_style.html command.
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All particles in the group must be finite-size. They cannot be point
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particles.
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[Related commands:] none
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"compute erotate/sphere"_compute_erotate_sphere.html
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[Default:] none
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