# compute dpd command

## Syntax

compute ID group-ID dpd

• ID, group-ID are documented in compute command
• dpd = style name of this compute command

## Examples

compute 1 all dpd


## Description

Define a computation that accumulates the total internal conductive energy (U_cond), the total internal mechanical energy (U_mech), the total chemical energy (U_chem) and the harmonic average of the internal temperature (dpdTheta) for the entire system of particles. See the compute dpd/atom command if you want per-particle internal energies and internal temperatures.

The system internal properties are computed according to the following relations:

where N is the number of particles in the system

Output info:

This compute calculates a global vector of length 5 (U_cond, U_mech, U_chem, dpdTheta, N_particles), which can be accessed by indices 1-5. See this section for an overview of LAMMPS output options.

The vector values will be in energy and temperature units.

## Restrictions

This command is part of the USER-DPD package. It is only enabled if LAMMPS was built with that package. See the Making LAMMPS section for more info.

This command also requires use of the atom_style dpd command.