[lammps-users] How to cancel the velocity?

Dear Lammps_users

       I want to set a velocity to a group of atoms at the beginning.
         After a period of running, I want to cancle the veloctiy.
         That is setting the group of atoms free.
         I used the script as follow:

Your commands look fine to me. I would try doing a dump
at the beginning/end of your runs and see if the velocities
of particular atoms are set to what you think they should be.