"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

timestep command :h3

[Syntax:]

timestep dt :pre

dt = timestep size (time units) :ul

[Examples:]

timestep 2.0 
timestep 0.003 :pre

[Description:]

Set the timestep size for subsequent molecular dynamics simulations.
See the "units"_units.html command for the time units associated with
each choice of units that LAMMPS supports.

The default value for the timestep size also depends on the choice of
units for the simulation; see the default values below.

When the "run style"_run_style.html is {respa}, dt is the timestep for
the outer loop (largest) timestep.

[Restrictions:] none

[Related commands:]

"fix dt/reset"_fix_dt_reset.html, "run"_run.html,
"run_style"_run_style.html respa, "units"_units.html

[Default:]

choice of "units"_units.html : time units : default timestep size
lj : tau : 0.005 tau
real : fmsec : 1.0 fmsec
metal : psec : 0.001 psec
si : sec : 1.0e-8 sec (10 nsec)
cgs : sec : 1.0e-8 sec (10 nsec)
electron : fmsec : 0.001 fmsec
micro : usec : 2.0 usec
nano : nsec : 0.00045 nsec :tb(s=:,a=l,ea=c)