\(\renewcommand{\AA}{\text{Å}}\)

# compute dpd/atom command

## Syntax

    compute ID group-ID dpd/atom

- ID, group-ID are documented in compute command

- dpd/atom = style name of this compute command

## Examples

    compute 1 all dpd/atom

## Description

Define a computation that accesses the per-particle internal conductive energy (\(u^\text{cond}\)), internal mechanical energy (\(u^\text{mech}\)), internal chemical energy (\(u^\text{chem}\)) and internal temperatures (\(\theta\)) for each particle in a group. See the compute dpd command if you want the total internal conductive energy, the total internal mechanical energy, the total chemical energy and average internal temperature of the entire system or group of dpd particles.

## Output info

This compute calculates a per-particle array with four columns (\(u^\text{cond}\), \(u^\text{mech}\), \(u^\text{chem}\), \(\theta\)), which can be accessed by indices 1–4 by any command that uses per-particle values from a compute as input. See the Howto output page for an overview of LAMMPS output options.

The per-particle array values will be in energy (\(u^\text{cond}\), \(u^\text{mech}\), \(u^\text{chem}\)) and temperature (\(\theta\)) units.

## Restrictions

This command is part of the DPD-REACT package. It is only enabled if LAMMPS was built with that package. See the Build package page for more info.

This command also requires use of the atom_style dpd command.

## Related commands

dump custom, compute dpd

## Default

none

(Larentzos) J.P. Larentzos, J.K. Brennan, J.D. Moore, and W.D. Mattson, “LAMMPS Implementation of Constant Energy Dissipative Particle Dynamics (DPD-E)”, ARL-TR-6863, U.S. Army Research Laboratory, Aberdeen Proving Ground, MD (2014).