Syntax:
fix ID group-ID addforce fx fy fz
Examples:
fix kick flow addforce 1.0 0.0 0.0
Description:
Add fx,fy,fz to the corresponding component of force for each atom in the group. This command can be used to give an additional push to atoms in a simulation, such as for a simulation of Poiseuille flow in a channel.
Restart, fix_modify, output, run start/stop, minimize info:
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 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", meaning they scale with the number of atoms in the simulation.
No parameter of this fix can be used with the start/stop keywords of the run command.
The forces due to this fix are imposed during an energy minimization, invoked by the minimize command.
Restrictions: none
Related commands:
Default: none