2013-09-06 06:59:35 +08:00
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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 erotate/rigid command :h3
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[Syntax:]
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compute ID group-ID erotate/rigid fix-ID :pre
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ID, group-ID are documented in "compute"_compute.html command
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erotate/rigid = style name of this compute command
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fix-ID = ID of rigid body fix :ul
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[Examples:]
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compute 1 all erotate/rigid myRigid :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 collection of rigid bodies, as defined by one of the "fix
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rigid"_fix_rigid.html command variants.
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The rotational energy of each rigid body is computed as 1/2 I Wbody^2,
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where I is the inertia tensor for the rigid body, and Wbody is its
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angular velocity vector. Both I and Wbody are in the frame of
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reference of the rigid body, i.e. I is diagonalized.
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The {fix-ID} should be the ID of one of the "fix rigid"_fix_rigid.html
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commands which defines the rigid bodies. The group specified in the
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compute command is ignored. The rotational energy of all the rigid
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bodies defined by the fix rigid command in included in the
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calculation.
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[Output info:]
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This compute calculates a global scalar (the summed rotational energy
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of all the rigid bodies). This value can be used by any command that
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uses a global scalar value from a compute as input. See
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"Section_howto 15"_Section_howto.html#howto_15 for an overview of
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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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2013-09-06 07:16:04 +08:00
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[Restrictions:]
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This compute is part of the RIGID package. It is only enabled if
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LAMMPS was built with that package. See the "Making
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LAMMPS"_Section_start.html#start_3 section for more info.
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2013-09-06 06:59:35 +08:00
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[Related commands:]
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"compute ke/rigid"_compute_erotate_ke_rigid.html
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[Default:] none
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