.. index:: timestep

timestep command
================

Syntax
""""""

.. parsed-literal::

   timestep dt

* dt = timestep size (time units)

Examples
""""""""

.. parsed-literal::

   timestep 2.0
   timestep 0.003

Description
"""""""""""

Set the timestep size for subsequent molecular dynamics simulations.
See the :doc:`units <units>` command for a discussion of time units.
The default value for the timestep also depends on the choice of units
for the simulation; see the default values below.

When the :doc:`run style <run_style>` is *respa*, dt is the timestep for
the outer loop (largest) timestep.

Restrictions
""""""""""""
 none

Related commands
""""""""""""""""

:doc:`fix dt/reset <fix_dt_reset>`, :doc:`run <run>`,
:doc:`run_style <run_style>` respa, :doc:`units <units>`

Default
"""""""

| timestep = 0.005 tau for units = lj
| timestep = 1.0 fmsec for units = real
| timestep = 0.001 psec for units = metal
| timestep = 1.0e-8 sec (10 nsec) for units = si or cgs 
| 


.. _liws: http://www.cfdem.com
.. _ld: Manual.html
.. _lc: Section_commands.html#comm