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[lammps-users] problem about “velocity” command
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[lammps-users] problem about “velocity” command


From: 吴胜 <ws930819@...6040...>
Date: Thu, 24 May 2018 10:17:09 +0800 (GMT+08:00)

Dear all,
      Something confused me about the “velocity” command. I used the command  "velocity all create 300.0 492845 rot yes dist gaussian"  to distribute velocity to all the molecular. According to my understanding , the velocity should be distributed randomly obeying gaussian distribution. Namely if i do the same simulation twice, the result should be different because the  velocity of molecular should be different. But according to my result, i find that if the calculation is  made in the same computer using the same cores, the result is the same. So that confused me a lot, how can  the “velocity” command  distribute the velocity?  and can it remain unchanged in the same input?
                                                                                                                                                                                                                                         Yours sincerely
                                                                                                                                                                                                                                         David bootman.