# fix nve/dot command

## Syntax

    fix ID group-ID nve/dot

-   ID, group-ID are documented in [fix](fix) command
-   nve/dot = style name of this fix command

## Examples

``` LAMMPS
fix 1 all nve/dot
```

## Description

Apply a rigid-body integrator as described in
[(Davidchack)](Davidchack4) to a group of atoms, but without Langevin
dynamics. This command performs Molecular dynamics (MD) via a
velocity-Verlet algorithm and an evolution operator that rotates the
quaternion degrees of freedom, similar to the scheme outlined in
[(Miller)](Miller4).

This command is the equivalent of the [fix
nve/dotc/langevin](fix_nve_dotc_langevin) without damping and noise and
can be used to determine the stability range in a NVE ensemble prior to
using the Langevin-type DOTC-integrator (see also [fix
nve/dotc/langevin](fix_nve_dotc_langevin)). The command is equivalent to
the [fix nve](fix_nve). The particles are always considered to have a
finite size.

An example input file can be found in
/examples/PACKAGES/cgdna/examples/duplex1/. Further details of the
implementation and stability of the integrator are contained in
[(Henrich)](Henrich4). The preprint version of the article can be found
[here](PDF/CG-DNA.pdf)\_.

------------------------------------------------------------------------

## Restrictions

These pair styles can only be used if LAMMPS was built with the
[CG-DNA](PKG-CG-DNA) package and the MOLECULE and ASPHERE package. See
the [Build package](Build_package) page for more info.

## Related commands

[fix nve/dotc/langevin](fix_nve_dotc_langevin), [fix nve](fix_nve)

## Default

none

------------------------------------------------------------------------

::: {#Davidchack4}
**(Davidchack)** R.L Davidchack, T.E. Ouldridge, and M.V. Tretyakov. J.
Chem. Phys. 142, 144114 (2015).
:::

::: {#Miller4}
**(Miller)** T. F. Miller III, M. Eleftheriou, P. Pattnaik, A. Ndirango,
G. J. Martyna, J. Chem. Phys., 116, 8649-8659 (2002).
:::

::: {#Henrich4}
**(Henrich)** O. Henrich, Y. A. Gutierrez-Fosado, T. Curk, T. E.
Ouldridge, Eur. Phys. J. E 41, 57 (2018).
:::