fix freeze command
Note
This command is old style, please see freeze for the new style command.
Syntax
fix ID group-ID freeze
ID, group-ID are documented in fix command
freeze = style name of this fix command
Examples
fix 2 bottom freeze
Description
Zero out the force and torque on a granular particle. This is useful for preventing certain particles from moving in a simulation. The granular pair styles also detect if this fix has been defined and compute interactions between frozen and non-frozen particles appropriately, as if the frozen particle has infinite mass.
Restart, fix_modify, output, run start/stop
No information about this fix is written to binary restart files. None of the fix_modify options are relevant to this fix.
This fix computes a global 3-vector of forces, which can be accessed by various output commands. This is the total force on the group of atoms before the forces on individual atoms are changed by the fix. The vector values calculated by this fix are “extensive”.
No parameter of this fix can be used with the start/stop keywords of the run command.
Restrictions
There can only be a single freeze fix defined. This is because other the granular pair styles treat frozen particles differently and need to be able to reference a single group to which this fix is applied.
Related commands: none
Default: none