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compute smd/ulsph/stress command

Syntax

compute ID group-ID smd/ulsph/stress

  • ID, group-ID are documented in compute command

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

Examples

compute 1 all smd/ulsph/stress

Description

Define a computation that outputs the Cauchy stress tensor.

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

Output info

This compute calculates a per-particle vector of vectors (tensors), which can be accessed by any command that uses per-particle values from a compute as input. See the Howto output doc page for an overview of LAMMPS output options.

The values will be given in units of pressure.

The per-particle vector has 7 entries. The first six entries correspond to the xx, yy, zz, xy, xz, yz components of the symmetric Cauchy stress tensor. The seventh entry is the second invariant of the stress tensor, i.e., the von Mises equivalent stress.

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.

Default

none