compute rigid command

Syntax

compute ID group-ID rigid property property_name

  • ID, group-ID are documented in compute command

  • property = obligatory keyword

  • property_name = xcm or vcm or fcm or torque or quat or angmom or omega or density or type or id or masstotal or inertia or ex_space or ey_space or ez_space

    xcm = body position (based on center of mass) (3 values)
vcm = body velocity (based on center of mass) (3 values)
fcm = body force (based on center of mass) (3 values)
torque = body torque (based on center of mass) (3 values)
quat = body quaternion (based on center of mass) (4 values)
angmom = body angular momentum (based on center of mass) (3 values)
omega = body angular velocity (based on center of mass) (3 values)
density = body density (1 value)
type = multi-sphere type as defined in fix paticleteplate/multisphere (1 value)
id = body id (1 value)
masstotal = body mass (1 value)
inertia = body intertia (based on center of mass, around ex_space, ey_space, ez_space) (3 values)
ex_space, ey_space, ez_space = eigensystem of the body (based on center of mass) (3 values each)

Examples

compute xcm all rigid property xcm

Description

Define a computation that calculates properties of individual multi-sphere bodies (clumps) in the simulation that were defined via fix particletemplate/multisphere

The local data stored by this command is generated by looping over the all the bodies owned on a process.

Warning

the group-ID is ignored for this command, as group data is atom-based, not clump-based.

Output info:

This compute calculates a local vector or local array depending on the length of the data (see above). The vector or array can be accessed by any command that uses local values from a compute as input. See this section for an overview of LAMMPS output options.

Restrictions

Can only be used together with a granular pair style. For accessing particle-wall contact data, only mesh walls can be used.