Syntax:
angle_style cosine/shift
Examples:
angle_style cosine/shift angle_coeff * 10.0 45.0
Description:
The cosine/shift angle style uses the potential
where theta0 is the equilibrium angle. The potential is bounded between -Umin and zero. In the neighborhood of the minimum E=- Umin + Umin/4(theta-theta0)^2 hence the spring constant is umin/2.
The following coefficients must be defined for each angle type via the angle_coeff command as in the example above, or in the data file or restart files read by the read_data or read_restart commands:
Restrictions:
This angle style can only be used if LAMMPS was built with the USER-MISC package. See the Making LAMMPS section for more info on packages.
Related commands:
angle_coeff, angle_cosineshiftexp
Default: none