forked from lijiext/lammps
75 lines
2.1 KiB
Plaintext
75 lines
2.1 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,Commands_all.html)
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:line
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dihedral_style quadratic command :h3
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dihedral_style quadratic/omp command :h3
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[Syntax:]
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dihedral_style quadratic :pre
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[Examples:]
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dihedral_style quadratic
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dihedral_coeff 100.0 80.0 :pre
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[Description:]
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The {quadratic} dihedral style uses the potential:
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:c,image(Eqs/dihedral_quadratic.jpg)
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This dihedral potential can be used to keep a dihedral in a predefined
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value (cis=zero, right-hand convention is used).
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The following coefficients must be defined for each dihedral type via
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the "dihedral_coeff"_dihedral_coeff.html command as in the example
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above, or in the data file or restart files read by the
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"read_data"_read_data.html or "read_restart"_read_restart.html
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commands:
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K (energy/radian^2)
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phi0 (degrees) :ul
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:line
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Styles with a {gpu}, {intel}, {kk}, {omp}, or {opt} suffix are
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functionally the same as the corresponding style without the suffix.
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They have been optimized to run faster, depending on your available
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hardware, as discussed on the "Speed packages"_Speed_packages.html doc
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page. The accelerated styles take the same arguments and should
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produce the same results, except for round-off and precision issues.
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These accelerated styles are part of the GPU, USER-INTEL, KOKKOS,
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USER-OMP and OPT packages, respectively. They are only enabled if
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LAMMPS was built with those packages. See the "Build
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package"_Build_package.html doc page for more info.
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You can specify the accelerated styles explicitly in your input script
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by including their suffix, or you can use the "-suffix command-line
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switch"_Run_options.html when you invoke LAMMPS, or you can use the
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"suffix"_suffix.html command in your input script.
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See the "Speed packages"_Speed_packages.html doc page for more
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instructions on how to use the accelerated styles effectively.
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:line
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[Restrictions:]
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This angle style can only be used if LAMMPS was built with the
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USER_MISC package. See the "Build package"_Build_package.html doc
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page for more info.
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[Related commands:]
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"dihedral_coeff"_dihedral_coeff.html
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[Default:] none
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