fix_wiggle.txt
b704a82dafc5lammm-master

fix_wiggle.txt
View Options

			"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

			:link(lws,http://lammps.sandia.gov)
			:link(ld,Manual.html)
			:link(lc,Section_commands.html#comm)

			:line

			fix wiggle command :h3

			[Syntax:]

			fix ID group-ID wiggle dim amplitude period

			ID, group-ID are documented in "fix"_fix.html command
			wiggle = style name of this fix command
			dim = {x} or {y} or {z}
			amplitude = size of oscillation (distance units)
			period = time of oscillation (time units) :ul

			[Examples:]

			fix 1 frozen wiggle 3.0 0.5 :pre

			[Description:]

			Move a group of atoms in a sinusoidal oscillation. This is useful in
			granular simulations when boundary atoms are wiggled to induce packing
			of the dynamic atoms. The dimension {dim} of movement is specified as
			is the {amplitude} and {period} of the oscillations. Each timestep
			the {dim} coordinate of each atom is set to

			coord = coord0 + A - A cos (omega * delta) :pre

			where {coord0} is the coordinate at the time the fix was specified,
			{A} is the {amplitude}, {omega} is 2 PI / {period}, and {delta} is the
			elapsed time since the fix was specified. The velocity of the atom is
			set to the derivative of this expression.

			[Restrictions:] none

			[Related commands:] none

			[Default:] none