$$\renewcommand{\AA}{\text{Å}}$$

# compute smd/ulsph/strain command¶

## Syntax¶

compute ID group-ID smd/ulsph/strain

• ID, group-ID are documented in compute command

• smd/ulsph/strain = style name of this compute command

## Examples¶

compute 1 all smd/ulsph/strain


## Description¶

Define a computation that outputs the logarithmic strain tensor. for particles interacting via the updated Lagrangian SPH pair style.

See this PDF guide to using Smooth Mach Dynamics in LAMMPS.

## Output info¶

This compute calculates a per-particle tensor, which can be accessed 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 vector has 6 entries, corresponding to the xx, yy, zz, xy, xz, yz components of the symmetric strain rate tensor.

The per-particle tensor values will be given dimensionless, see units.

## Restrictions¶

This compute is part of the MACHDYN package. It is only enabled if LAMMPS was built with that package. See the Build package page for more info. This compute can only be used for particles which interact with the updated Lagrangian SPH pair style.

none