LAMMPS WWW Site - LAMMPS Documentation - LAMMPS Commands

### timestep command

Syntax:

    timestep dt

- dt = timestep size (time units)

Examples:

    timestep 2.0
    timestep 0.003

Description:

Set the timestep size for subsequent molecular dynamics simulations. See the units 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 is respa, dt is the timestep for the outer loop (largest) timestep.

Restrictions: none

Related commands:

fix dt/reset, run, run_style respa, units

Default:

choice of units | 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